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Shareholder Report
 12 Months Ended
Dec. 31, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name IMPAX FUNDS SERIES TRUST I
Entity Central Index Key 0000076721
Entity Investment Company Type N-1A
Document Period End Date Dec. 31, 2024
C000175861  
Shareholder Report [Line Items]  
Fund Name Impax Large Cap Fund
Class Name Investor Class
Trading Symbol PAXLX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Large Cap Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/LC. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/LC
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$105
0.98%
Expenses Paid, Amount $ 105
Expense Ratio, Percent 0.98%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Large Cap Fund Investor Class $27,019
S&P 500 Index $29,942
Lipper Multi-Cap Core Funds Index $26,171
12/16/2016
10,000
10,000
10,000
12/31/2016
9,917
9,922
9,925
06/30/2017
10,770
10,849
10,779
12/31/2017
11,965
12,088
11,964
06/30/2018
12,339
12,408
12,246
12/31/2018
11,366
11,558
11,040
06/30/2019
13,484
13,701
13,045
12/31/2019
15,327
15,197
14,251
06/30/2020
15,020
14,729
13,782
12/31/2020
18,967
17,994
17,302
06/30/2021
22,626
20,738
19,764
12/31/2021
24,765
23,159
21,330
06/30/2022
19,864
18,536
16,989
12/31/2022
19,815
18,964
17,492
06/30/2023
22,088
22,168
20,043
12/31/2023
23,758
23,950
21,717
06/30/2024
25,936
27,612
24,368
12/31/2024
27,019
29,942
26,171
Average Annual Return [Table Text Block]
1 Year
5 years
Since Inception (12/16/16)
Investor Class - (Incorp December 16, 2016)
13.72%
11.99%
13.15%
S&P 500 Index
25.02
14.53
14.92
Lipper Multi-Cap Core Funds Index
20.51
12.89
12.70
Performance Inception Date Dec. 16, 2016
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 1,369,084,701
Holdings Count | Holding 53
Advisory Fees Paid, Amount $ 9,409,925
InvestmentCompanyPortfolioTurnover 36.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$1,369,084,701
Total Number of Portfolio Holdings
53
Total Investment Advisory Fees Paid During the Reporting Period
$9,409,925
Portfolio Turnover Rate
36%
Holdings [Text Block]
Company
Percent of Net Assets
Microsoft Corp.
7.5%
Alphabet, Inc., A
5.8%
NVIDIA Corp.
5.2%
Apple, Inc.
4.2%
Oracle Corp.
2.6%
JPMorgan Chase & Co.
2.6%
Visa, Inc., A
2.6%
Marvell Technology, Inc.
2.5%
Walt Disney Co. (The)
2.3%
ServiceNow, Inc.
2.2%
Value
Value
Other assets and liabilities (net)
0.5%
OthersFootnote Reference†
35.1%
Insurance
3.1%
Machinery
3.7%
Specialty Retail
3.8%
Financial Services
4.6%
Banks
5.1%
Interactive Media & Services
5.8%
Technology Hardware, Storage & Peripherals
6.0%
Life Sciences Tools & Services
6.7%
Semiconductors & Semiconductor Equipment
10.3%
Software
15.3%
Value
Value
U.S. Stocks
95.2%
Foreign Stocks
4.3%
Cash & Cash Equivalents
0.5%
Material Fund Change [Text Block]

 

   

C000175860  
Shareholder Report [Line Items]  
Fund Name Impax Large Cap Fund
Class Name Institutional Class
Trading Symbol PXLIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Large Cap Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/LC. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/LC
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$78
0.73%
Expenses Paid, Amount $ 78
Expense Ratio, Percent 0.73%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Large Cap Fund (Institutional Class) $688,705
S&P 500 Index $748,546
Lipper Multi-Cap Core Funds Index $654,286
12/16/2016
$250,000
$250,000
$250,000
12/31/2016
$247,925
$248,050
$248,134
06/30/2017
$269,433
$271,222
$269,482
12/31/2017
$299,893
$302,203
$299,096
06/30/2018
$309,572
$310,208
$306,144
12/31/2018
$285,523
$288,954
$275,991
06/30/2019
$339,056
$342,523
$326,113
12/31/2019
$386,126
$379,935
$356,272
06/30/2020
$378,972
$368,230
$344,538
12/31/2020
$478,747
$449,838
$432,540
06/30/2021
$571,739
$518,446
$494,090
12/31/2021
$626,775
$578,966
$533,246
06/30/2022
$503,396
$463,409
$424,737
12/31/2022
$502,833
$474,110
$437,290
06/30/2023
$560,976
$554,209
$501,064
12/31/2023
$604,017
$598,742
$542,932
06/30/2024
$660,386
$690,302
$609,210
12/31/2024
$688,705
$748,546
$654,286
Average Annual Return [Table Text Block]
1 Year
5 years
Since Inception (12/16/16)
Institutional Class - (Incorp December 16, 2016)
14.02%
12.26%
13.42%
S&P 500 Index
25.02
14.53
14.92
Lipper Multi-Cap Core Funds Index
20.51
12.89
12.70
Performance Inception Date Dec. 16, 2016
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 1,369,084,701
Holdings Count | Holding 53
Advisory Fees Paid, Amount $ 9,409,925
InvestmentCompanyPortfolioTurnover 36.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$1,369,084,701
Total Number of Portfolio Holdings
53
Total Investment Advisory Fees Paid During the Reporting Period
$9,409,925
Portfolio Turnover Rate
36%
Holdings [Text Block]
Company
Percent of Net Assets
Microsoft Corp.
7.5%
Alphabet, Inc., A
5.8%
NVIDIA Corp.
5.2%
Apple, Inc.
4.2%
Oracle Corp.
2.6%
JPMorgan Chase & Co.
2.6%
Visa, Inc., A
2.6%
Marvell Technology, Inc.
2.5%
Walt Disney Co. (The)
2.3%
ServiceNow, Inc.
2.2%
Value
Value
Other assets and liabilities (net)
0.5%
OthersFootnote Reference†
35.1%
Insurance
3.1%
Machinery
3.7%
Specialty Retail
3.8%
Financial Services
4.6%
Banks
5.1%
Interactive Media & Services
5.8%
Technology Hardware, Storage & Peripherals
6.0%
Life Sciences Tools & Services
6.7%
Semiconductors & Semiconductor Equipment
10.3%
Software
15.3%
Value
Value
U.S. Stocks
95.2%
Foreign Stocks
4.3%
Cash & Cash Equivalents
0.5%
Material Fund Change [Text Block]

 

   

C000061360  
Shareholder Report [Line Items]  
Fund Name Impax Small Cap Fund
Class Name Investor Class
Trading Symbol PXSCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Small Cap Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/SC. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/SC
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$123
1.15%
Expenses Paid, Amount $ 123
Expense Ratio, Percent 1.15%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Small Cap Fund Investor Class $18,648
S&P 500 Index $34,254
Russell 2000 Index $21,223
12/31/2014
$10,000
$10,000
$10,000
12/31/2015
$9,615
$10,138
$9,559
12/31/2016
$11,336
$11,351
$11,595
12/31/2017
$12,330
$13,829
$13,294
12/31/2018
$10,382
$13,223
$11,830
12/31/2019
$12,800
$17,386
$14,849
12/31/2020
$14,307
$20,585
$17,813
12/31/2021
$18,625
$26,494
$20,453
12/31/2022
$14,346
$21,696
$16,273
12/31/2023
$16,285
$27,399
$19,028
12/31/2024
$18,648
$34,254
$21,223
Average Annual Return [Table Text Block]
1 Year
5 years
10 Years
Investor Class
14.51%
7.81%
6.42%
S&P 500 IndexFootnote Reference*
25.02
14.53
13.10
Russell 2000 Index
11.54
7.40
7.82
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 725,997,492
Holdings Count | Holding 67
Advisory Fees Paid, Amount $ 5,247,828
InvestmentCompanyPortfolioTurnover 48.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$725,997,492
Total Number of Portfolio Holdings
67
Total Investment Advisory Fees Paid During the Reporting Period
$5,247,828
Portfolio Turnover Rate
48%
Holdings [Text Block]
Company
Percent of Net Assets
Victory Capital Holdings, Inc., A
5.6%
Ligand Pharmaceuticals, Inc.
4.1%
Brightsphere Investment Group, Inc.
3.6%
Roivant Sciences Ltd.
3.3%
US Foods Holding Corp.
2.8%
Health Catalyst, Inc.
2.7%
Howard Hughes Holdings, Inc.
2.5%
Element Solutions, Inc.
2.2%
Generac Holdings, Inc.
2.1%
Cullen/Frost Bankers, Inc.
2.1%
Value
Value
Other assets and liabilities (net)
0.3%
OthersFootnote Reference†
41.8%
Construction & Engineering
3.7%
Food Products
4.0%
Banks
4.1%
Consumer Staples Distribution & Retail
4.5%
Communications Equipment
4.8%
Health Care Equipment & Supplies
5.7%
Software
6.8%
Pharmaceuticals
6.9%
Biotechnology
8.0%
Capital Markets
9.4%
Value
Value
U.S. Stocks
95.7%
Foreign Stocks
3.6%
Cash & Cash Equivalents
0.7%
Material Fund Change [Text Block]

 

   

C000128850  
Shareholder Report [Line Items]  
Fund Name Impax Small Cap Fund
Class Name Class A
Trading Symbol PXSAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Small Cap Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/SC. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/SC
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$123
1.15%
Expenses Paid, Amount $ 123
Expense Ratio, Percent 1.15%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Small Cap Fund Class A $17,796
S&P 500 Index $34,254
Russell 2000 Index $21,223
12/31/2014
$9,550
$10,000
$10,000
12/31/2015
$9,181
$10,138
$9,559
12/31/2016
$10,820
$11,351
$11,595
12/31/2017
$11,771
$13,829
$13,294
12/31/2018
$9,910
$13,223
$11,830
12/31/2019
$12,215
$17,386
$14,849
12/31/2020
$13,649
$20,585
$17,813
12/31/2021
$17,784
$26,494
$20,453
12/31/2022
$13,687
$21,696
$16,273
12/31/2023
$15,543
$27,399
$19,028
12/31/2024
$17,796
$34,254
$21,223
Average Annual Return [Table Text Block]
1 Year
5 years
10 Years
Class A
14.49%
7.81%
6.42%
S&P 500 IndexFootnote Reference*
25.02
14.53
13.10
Russell 2000 Index
11.54
7.40
7.82
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 725,997,492
Holdings Count | Holding 67
Advisory Fees Paid, Amount $ 5,247,828
InvestmentCompanyPortfolioTurnover 48.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$725,997,492
Total Number of Portfolio Holdings
67
Total Investment Advisory Fees Paid During the Reporting Period
$5,247,828
Portfolio Turnover Rate
48%
Holdings [Text Block]
Company
Percent of Net Assets
Victory Capital Holdings, Inc., A
5.6%
Ligand Pharmaceuticals, Inc.
4.1%
Brightsphere Investment Group, Inc.
3.6%
Roivant Sciences Ltd.
3.3%
US Foods Holding Corp.
2.8%
Health Catalyst, Inc.
2.7%
Howard Hughes Holdings, Inc.
2.5%
Element Solutions, Inc.
2.2%
Generac Holdings, Inc.
2.1%
Cullen/Frost Bankers, Inc.
2.1%
Value
Value
Other assets and liabilities (net)
0.3%
OthersFootnote Reference†
41.8%
Construction & Engineering
3.7%
Food Products
4.0%
Banks
4.1%
Consumer Staples Distribution & Retail
4.5%
Communications Equipment
4.8%
Health Care Equipment & Supplies
5.7%
Software
6.8%
Pharmaceuticals
6.9%
Biotechnology
8.0%
Capital Markets
9.4%
Value
Value
U.S. Stocks
95.7%
Foreign Stocks
3.6%
Cash & Cash Equivalents
0.7%
Material Fund Change [Text Block]

 

   

C000061361  
Shareholder Report [Line Items]  
Fund Name Impax Small Cap Fund
Class Name Institutional Class
Trading Symbol PXSIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Small Cap Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/SC. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/SC
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$97
0.90%
Expenses Paid, Amount $ 97
Expense Ratio, Percent 0.90%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Small Cap Fund (Institutional Class) $477,904
S&P 500 Index $856,351
Russell 2000 Index $530,579
12/31/2014
$250,000
$250,000
$250,000
12/31/2015
$240,950
$253,460
$238,965
12/31/2016
$284,736
$283,773
$289,883
12/31/2017
$310,650
$345,725
$332,343
12/31/2018
$262,229
$330,567
$295,739
12/31/2019
$324,003
$434,651
$371,226
12/31/2020
$363,072
$514,622
$445,326
12/31/2021
$473,967
$662,346
$511,319
12/31/2022
$365,892
$542,390
$406,823
12/31/2023
$416,334
$684,971
$475,694
12/31/2024
$477,904
$856,351
$530,579
Average Annual Return [Table Text Block]
1 Year
5 years
10 Years
Institutional Class
14.79%
8.07%
6.69%
S&P 500 IndexFootnote Reference*
25.02
14.53
13.10
Russell 2000 Index
11.54
7.40
7.82
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 725,997,492
Holdings Count | Holding 67
Advisory Fees Paid, Amount $ 5,247,828
InvestmentCompanyPortfolioTurnover 48.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$725,997,492
Total Number of Portfolio Holdings
67
Total Investment Advisory Fees Paid During the Reporting Period
$5,247,828
Portfolio Turnover Rate
48%
Holdings [Text Block]
Company
Percent of Net Assets
Victory Capital Holdings, Inc., A
5.6%
Ligand Pharmaceuticals, Inc.
4.1%
Brightsphere Investment Group, Inc.
3.6%
Roivant Sciences Ltd.
3.3%
US Foods Holding Corp.
2.8%
Health Catalyst, Inc.
2.7%
Howard Hughes Holdings, Inc.
2.5%
Element Solutions, Inc.
2.2%
Generac Holdings, Inc.
2.1%
Cullen/Frost Bankers, Inc.
2.1%
Value
Value
Other assets and liabilities (net)
0.3%
OthersFootnote Reference†
41.8%
Construction & Engineering
3.7%
Food Products
4.0%
Banks
4.1%
Consumer Staples Distribution & Retail
4.5%
Communications Equipment
4.8%
Health Care Equipment & Supplies
5.7%
Software
6.8%
Pharmaceuticals
6.9%
Biotechnology
8.0%
Capital Markets
9.4%
Value
Value
U.S. Stocks
95.7%
Foreign Stocks
3.6%
Cash & Cash Equivalents
0.7%
Material Fund Change [Text Block]

 

   

C000043241  
Shareholder Report [Line Items]  
Fund Name Impax US Sustainable Economy Fund
Class Name Investor Class
Trading Symbol PXWGX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax US Sustainable Economy Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/USSE. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/USSE
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$78
0.71%
Expenses Paid, Amount $ 78
Expense Ratio, Percent 0.71%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax US Sustainable Economy Fund Investor Class $29,018
S&P 500 Index $34,254
Russell 1000 Index $33,560
12/31/2014
$10,000
$10,000
$10,000
12/31/2015
$10,220
$10,138
$10,092
12/31/2016
$10,860
$11,351
$11,308
12/31/2017
$13,237
$13,829
$13,761
12/31/2018
$12,650
$13,223
$13,102
12/31/2019
$16,082
$17,386
$17,220
12/31/2020
$18,228
$20,585
$20,830
12/31/2021
$23,699
$26,494
$26,340
12/31/2022
$19,374
$21,696
$21,302
12/31/2023
$24,099
$27,399
$26,953
12/31/2024
$29,018
$34,254
$33,560
Average Annual Return [Table Text Block]
1 Year
5 years
10 Years
Investor Class
20.41%
12.52%
11.23%
S&P 500 IndexFootnote Reference*
25.02
14.53
13.10
Russell 1000 Index
24.51
14.28
12.87
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 336,491,410
Holdings Count | Holding 134
Advisory Fees Paid, Amount $ 1,451,929
InvestmentCompanyPortfolioTurnover 45.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$336,491,410
Total Number of Portfolio Holdings
134
Total Investment Advisory Fees Paid During the Reporting Period
$1,451,929
Portfolio Turnover Rate
45%
Holdings [Text Block]
Company
Percent of Net Assets
Apple, Inc.
6.9%
NVIDIA Corp.
6.7%
Microsoft Corp.
5.6%
Visa, Inc., A
2.4%
Mastercard, Inc., A
2.3%
Alphabet, Inc., A
2.3%
Broadcom, Inc.
2.2%
Union Pacific Corp.
1.8%
Gilead Sciences, Inc.
1.7%
Progressive Corp. (The)
1.7%
Value
Value
Other assets and liabilities (net)
1.6%
OthersFootnote Reference†
37.9%
Biotechnology
2.9%
Building Products
3.4%
Interactive Media & Services
3.7%
Chemicals
3.7%
Pharmaceuticals
4.2%
Insurance
4.8%
Financial Services
5.0%
Technology Hardware, Storage & Peripherals
7.2%
Software
12.2%
Semiconductors & Semiconductor Equipment
13.4%
Value
Value
U.S. Stocks
97.9%
Cash & Cash Equivalents
1.2%
Foreign Stocks
0.9%
Material Fund Change [Text Block]

 

   

C000128848  
Shareholder Report [Line Items]  
Fund Name Impax US Sustainable Economy Fund
Class Name Class A
Trading Symbol PXGAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax US Sustainable Economy Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/USSE. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/USSE
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$78
0.71%
Expenses Paid, Amount $ 78
Expense Ratio, Percent 0.71%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax US Sustainable Economy Fund Class A $27,492
S&P 500 Index $34,254
Russell 1000 Index $33,560
12/31/2014
$9,450
$10,000
$10,000
12/31/2015
$9,661
$10,138
$10,092
12/31/2016
$10,264
$11,351
$11,308
12/31/2017
$12,518
$13,829
$13,761
12/31/2018
$11,963
$13,223
$13,102
12/31/2019
$15,203
$17,386
$17,220
12/31/2020
$17,229
$20,585
$20,830
12/31/2021
$22,396
$26,494
$26,340
12/31/2022
$18,312
$21,696
$21,302
12/31/2023
$22,779
$27,399
$26,953
12/31/2024
$27,492
$34,254
$33,560
Average Annual Return [Table Text Block]
1 Year
5 years
10 Years
Class A
20.37%
12.51%
11.23%
S&P 500 IndexFootnote Reference*
25.02
14.53
13.10
Russell 1000 Index
24.51
14.28
12.87
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 336,491,410
Holdings Count | Holding 134
Advisory Fees Paid, Amount $ 1,451,929
InvestmentCompanyPortfolioTurnover 45.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$336,491,410
Total Number of Portfolio Holdings
134
Total Investment Advisory Fees Paid During the Reporting Period
$1,451,929
Portfolio Turnover Rate
45%
Holdings [Text Block]
Company
Percent of Net Assets
Apple, Inc.
6.9%
NVIDIA Corp.
6.7%
Microsoft Corp.
5.6%
Visa, Inc., A
2.4%
Mastercard, Inc., A
2.3%
Alphabet, Inc., A
2.3%
Broadcom, Inc.
2.2%
Union Pacific Corp.
1.8%
Gilead Sciences, Inc.
1.7%
Progressive Corp. (The)
1.7%
Value
Value
Other assets and liabilities (net)
1.6%
OthersFootnote Reference†
37.9%
Biotechnology
2.9%
Building Products
3.4%
Interactive Media & Services
3.7%
Chemicals
3.7%
Pharmaceuticals
4.2%
Insurance
4.8%
Financial Services
5.0%
Technology Hardware, Storage & Peripherals
7.2%
Software
12.2%
Semiconductors & Semiconductor Equipment
13.4%
Value
Value
U.S. Stocks
97.9%
Cash & Cash Equivalents
1.2%
Foreign Stocks
0.9%
Material Fund Change [Text Block]

 

   

C000043242  
Shareholder Report [Line Items]  
Fund Name Impax US Sustainable Economy Fund
Class Name Institutional Class
Trading Symbol PWGIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax US Sustainable Economy Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/USSE. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/USSE
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$50
0.46%
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.46%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax US Sustainable Economy Fund (Institutional Class) $741,778
S&P 500 Index $856,351
Russell 1000 Index $838,991
12/31/2014
$250,000
$250,000
$250,000
12/31/2015
$256,258
$253,460
$252,294
12/31/2016
$272,899
$283,773
$282,705
12/31/2017
$333,525
$345,725
$344,015
12/31/2018
$319,648
$330,567
$327,557
12/31/2019
$407,295
$434,651
$430,496
12/31/2020
$462,572
$514,622
$520,742
12/31/2021
$602,947
$662,346
$658,504
12/31/2022
$494,385
$542,390
$532,552
12/31/2023
$616,248
$684,971
$673,834
12/31/2024
$741,778
$856,351
$838,991
Average Annual Return [Table Text Block]
1 Year
5 years
10 Years
Institutional Class
20.69%
12.78%
11.51%
S&P 500 IndexFootnote Reference*
25.02
14.53
13.10
Russell 1000 Index
24.51
14.28
12.87
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 336,491,410
Holdings Count | Holding 134
Advisory Fees Paid, Amount $ 1,451,929
InvestmentCompanyPortfolioTurnover 45.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$336,491,410
Total Number of Portfolio Holdings
134
Total Investment Advisory Fees Paid During the Reporting Period
$1,451,929
Portfolio Turnover Rate
45%
Holdings [Text Block]
Company
Percent of Net Assets
Apple, Inc.
6.9%
NVIDIA Corp.
6.7%
Microsoft Corp.
5.6%
Visa, Inc., A
2.4%
Mastercard, Inc., A
2.3%
Alphabet, Inc., A
2.3%
Broadcom, Inc.
2.2%
Union Pacific Corp.
1.8%
Gilead Sciences, Inc.
1.7%
Progressive Corp. (The)
1.7%
Value
Value
Other assets and liabilities (net)
1.6%
OthersFootnote Reference†
37.9%
Biotechnology
2.9%
Building Products
3.4%
Interactive Media & Services
3.7%
Chemicals
3.7%
Pharmaceuticals
4.2%
Insurance
4.8%
Financial Services
5.0%
Technology Hardware, Storage & Peripherals
7.2%
Software
12.2%
Semiconductors & Semiconductor Equipment
13.4%
Value
Value
U.S. Stocks
97.9%
Cash & Cash Equivalents
1.2%
Foreign Stocks
0.9%
Material Fund Change [Text Block]

 

   

C000175865  
Shareholder Report [Line Items]  
Fund Name Impax Global Sustainable Infrastructure Fund
Class Name Investor Class
Trading Symbol PAXDX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Global Sustainable Infrastructure Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/GSI. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/GSI
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$86
0.87%
Expenses Paid, Amount $ 86
Expense Ratio, Percent 0.87%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Global Sustainable Infrastructure Fund Investor Class $17,265
MSCI ACWI Index (Net) $22,956
FTSE Global Infrastructure Opportunities Index $16,694
12/16/2016
10,000
10,000
10,000
12/31/2016
9,911
9,997
10,056
06/30/2017
10,582
11,144
10,923
12/31/2017
11,818
12,394
11,702
06/30/2018
11,917
12,340
11,202
12/31/2018
11,320
11,227
10,663
06/30/2019
12,984
13,049
12,154
12/31/2019
14,246
14,213
12,965
06/30/2020
13,672
13,324
11,437
12/31/2020
16,275
16,523
13,443
06/30/2021
17,970
18,556
14,994
12/31/2021
18,532
19,586
15,389
06/30/2022
16,094
15,633
13,965
12/31/2022
16,042
15,989
13,998
06/30/2023
17,283
18,217
14,660
12/31/2023
17,538
19,539
15,419
06/30/2024
17,632
21,747
15,691
12/31/2024
17,265
22,956
16,694
Average Annual Return [Table Text Block]
1 Year
5 years
Since Inception (12/16/16)
Investor Class - (Incorp December 16, 2016)
-1.56%
3.91%
7.02%
MSCI ACWI Index (Net)Footnote Reference*
17.49
10.06
10.88
FTSE Global Infrastructure Opportunities Index
8.27
5.19
6.58
Performance Inception Date Dec. 16, 2016
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 88,239,706
Holdings Count | Holding 42
Advisory Fees Paid, Amount $ 582,839
InvestmentCompanyPortfolioTurnover 34.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$88,239,706
Total Number of Portfolio Holdings
42
Total Investment Advisory Fees Paid During the Reporting Period
$582,839
Portfolio Turnover Rate
34%
Holdings [Text Block]
Company
Percent of Net Assets
SSE plc
4.0%
Waste Management, Inc.
4.0%
Chemed Corp.
3.9%
Veolia Environnement SA
3.8%
Elisa OYJ
3.8%
Welltower, Inc.
3.7%
National Grid plc
3.7%
United Utilities Group plc
3.5%
Canadian Pacific Kansas City Ltd.
3.5%
American Tower Corp.
3.4%
Value
Value
Other assets and liabilities (net)
2.2%
OthersFootnote Reference‡
8.0%
Japan
2.6%
Germany
2.6%
Spain
2.8%
Netherlands
3.0%
Sweden
3.0%
France
3.8%
Finland
5.3%
Canada
7.8%
United Kingdom
17.4%
United States
41.5%
Value
Value
Foreign Stocks
56.6%
U.S. Stocks
41.8%
Cash & Cash Equivalents
1.6%
Material Fund Change [Text Block]

 

   

C000175864  
Shareholder Report [Line Items]  
Fund Name Impax Global Sustainable Infrastructure Fund
Class Name Institutional Class
Trading Symbol PXDIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Global Sustainable Infrastructure Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/GSI. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/GSI
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$61
0.62%
Expenses Paid, Amount $ 61
Expense Ratio, Percent 0.62%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Global Sustainable Infrastructure Fund (Institutional Class) $440,385
MSCI ACWI Index (Net) $573,912
FTSE Global Infrastructure Opportunities Index $417,358
12/16/2016
$250,000
$250,000
$250,000
12/31/2016
$247,775
$249,928
$251,398
06/30/2017
$264,963
$278,612
$273,071
12/31/2017
$295,944
$309,841
$292,562
06/30/2018
$299,201
$308,500
$280,055
12/31/2018
$284,568
$280,672
$266,585
06/30/2019
$326,937
$326,215
$303,838
12/31/2019
$359,076
$355,323
$324,127
06/30/2020
$345,029
$333,107
$285,914
12/31/2020
$411,295
$413,080
$336,079
06/30/2021
$454,461
$463,900
$374,859
12/31/2021
$469,519
$489,655
$384,716
06/30/2022
$408,071
$390,834
$349,136
12/31/2022
$407,287
$399,734
$349,954
06/30/2023
$439,643
$455,435
$366,488
12/31/2023
$446,172
$488,483
$385,478
06/30/2024
$449,065
$543,685
$392,285
12/31/2024
$440,385
$573,912
$417,358
Average Annual Return [Table Text Block]
1 Year
5 years
Since Inception (12/16/16)
Institutional Class - (Incorp December 16, 2016)
-1.30%
4.16%
7.29%
MSCI ACWI Index (Net)Footnote Reference*
17.49
10.06
10.88
FTSE Global Infrastructure Opportunities Index
8.27
5.19
6.58
Performance Inception Date Dec. 16, 2016
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 88,239,706
Holdings Count | Holding 42
Advisory Fees Paid, Amount $ 582,839
InvestmentCompanyPortfolioTurnover 34.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$88,239,706
Total Number of Portfolio Holdings
42
Total Investment Advisory Fees Paid During the Reporting Period
$582,839
Portfolio Turnover Rate
34%
Holdings [Text Block]
Company
Percent of Net Assets
SSE plc
4.0%
Waste Management, Inc.
4.0%
Chemed Corp.
3.9%
Veolia Environnement SA
3.8%
Elisa OYJ
3.8%
Welltower, Inc.
3.7%
National Grid plc
3.7%
United Utilities Group plc
3.5%
Canadian Pacific Kansas City Ltd.
3.5%
American Tower Corp.
3.4%
Value
Value
Other assets and liabilities (net)
2.2%
OthersFootnote Reference‡
8.0%
Japan
2.6%
Germany
2.6%
Spain
2.8%
Netherlands
3.0%
Sweden
3.0%
France
3.8%
Finland
5.3%
Canada
7.8%
United Kingdom
17.4%
United States
41.5%
Value
Value
Foreign Stocks
56.6%
U.S. Stocks
41.8%
Cash & Cash Equivalents
1.6%
Material Fund Change [Text Block]

 

   

C000201508  
Shareholder Report [Line Items]  
Fund Name Impax Global Opportunities Fund
Class Name Investor Class
Trading Symbol PAXGX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Global Opportunities Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/GO. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/GO
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$127
1.23%
Expenses Paid, Amount $ 127
Expense Ratio, Percent 1.23%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Global Opportunities Fund Investor Class $17,754
MSCI ACW Index (Net) $18,747
Lipper Global Large Cap Growth Funds Index $19,106
06/27/2018
10,000
10,000
10,000
06/30/2018
9,970
10,077
10,118
12/31/2018
9,180
9,168
9,312
06/30/2019
11,511
10,656
11,130
12/31/2019
12,256
11,607
12,091
06/30/2020
11,981
10,881
12,367
12/31/2020
15,045
13,493
15,385
06/30/2021
16,328
15,154
17,016
12/31/2021
17,858
15,995
17,701
06/30/2022
13,658
12,767
12,743
12/31/2022
14,526
13,058
12,849
06/30/2023
16,312
14,877
15,231
12/31/2023
16,727
15,957
16,255
06/30/2024
17,627
17,760
18,369
12/31/2024
17,754
18,747
19,106
Average Annual Return [Table Text Block]
1 Year
5 years
Since Inception (6/27/18)
Investor Class - (Incorp June 27, 2018)
6.14%
7.69%
9.21%
MSCI ACW Index (Net)
17.49
10.06
9.80
Lipper Global Large Cap Growth Funds Index
17.54
9.58
10.44
Performance Inception Date Jun. 27, 2018
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 125,995,694
Holdings Count | Holding 42
Advisory Fees Paid, Amount $ 904,233
InvestmentCompanyPortfolioTurnover 32.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$125,995,694
Total Number of Portfolio Holdings
42
Total Investment Advisory Fees Paid During the Reporting Period
$904,233
Portfolio Turnover Rate
32%
Holdings [Text Block]
Company
Percent of Net Assets
Microsoft Corp.
4.5%
Mastercard, Inc., A
4.3%
Boston Scientific Corp.
4.0%
Alcon AG
3.8%
Linde plc
3.5%
Marsh & McLennan Cos., Inc.
3.3%
Schneider Electric SE
3.3%
NVIDIA Corp.
3.3%
Thermo Fisher Scientific, Inc.
3.3%
Cadence Design Systems, Inc.
3.0%
Value
Value
Other assets and liabilities (net)
1.0%
OthersFootnote Reference‡
2.6%
Portugal
1.6%
Ireland
2.0%
India
2.1%
Hong Kong
2.6%
Bermuda
2.7%
Netherlands
3.1%
Japan
4.4%
Switzerland
6.3%
United Kingdom
10.0%
United States
61.6%
Value
Value
U.S. Stocks
61.6%
Foreign Stocks
37.4%
Cash & Cash Equivalents
1.0%
Material Fund Change [Text Block]

 

   

C000201507  
Shareholder Report [Line Items]  
Fund Name Impax Global Opportunities Fund
Class Name Institutional Class
Trading Symbol PXGOX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Global Opportunities Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/GO. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/GO
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$101
0.98%
Expenses Paid, Amount $ 101
Expense Ratio, Percent 0.98%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Global Opportunities Fund (Institutional Class) $450,315
MSCI ACW Index (Net) $468,678
Lipper Global Large Cap Growth Funds Index $477,652
06/27/2018
$250,000
$250,000
$250,000
06/30/2018
$249,250
$251,932
$252,958
12/31/2018
$229,500
$229,204
$232,787
06/30/2019
$287,933
$266,400
$278,239
12/31/2019
$306,895
$290,169
$302,287
06/30/2020
$300,523
$272,027
$309,179
12/31/2020
$377,840
$337,336
$384,624
06/30/2021
$410,562
$378,839
$425,407
12/31/2021
$449,488
$399,870
$442,533
06/30/2022
$344,328
$319,170
$318,583
12/31/2022
$366,380
$326,438
$321,218
06/30/2023
$412,216
$371,925
$380,764
12/31/2023
$423,176
$398,913
$406,383
06/30/2024
$446,586
$443,994
$459,235
12/31/2024
$450,315
$468,678
$477,652
Average Annual Return [Table Text Block]
1 Year
5 years
Since Inception (6/27/18)
Institutional Class - (Incorp June 27, 2018)
6.41%
7.96%
9.45%
MSCI ACW Index (Net)
17.49
10.06
9.80
Lipper Global Large Cap Growth Funds Index
17.54
9.58
10.44
Performance Inception Date Jun. 27, 2018
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 125,995,694
Holdings Count | Holding 42
Advisory Fees Paid, Amount $ 904,233
InvestmentCompanyPortfolioTurnover 32.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$125,995,694
Total Number of Portfolio Holdings
42
Total Investment Advisory Fees Paid During the Reporting Period
$904,233
Portfolio Turnover Rate
32%
Holdings [Text Block]
Company
Percent of Net Assets
Microsoft Corp.
4.5%
Mastercard, Inc., A
4.3%
Boston Scientific Corp.
4.0%
Alcon AG
3.8%
Linde plc
3.5%
Marsh & McLennan Cos., Inc.
3.3%
Schneider Electric SE
3.3%
NVIDIA Corp.
3.3%
Thermo Fisher Scientific, Inc.
3.3%
Cadence Design Systems, Inc.
3.0%
Value
Value
Other assets and liabilities (net)
1.0%
OthersFootnote Reference‡
2.6%
Portugal
1.6%
Ireland
2.0%
India
2.1%
Hong Kong
2.6%
Bermuda
2.7%
Netherlands
3.1%
Japan
4.4%
Switzerland
6.3%
United Kingdom
10.0%
United States
61.6%
Value
Value
U.S. Stocks
61.6%
Foreign Stocks
37.4%
Cash & Cash Equivalents
1.0%
Material Fund Change [Text Block]

 

   

C000061357  
Shareholder Report [Line Items]  
Fund Name Impax Global Environmental Markets Fund
Class Name Investor Class
Trading Symbol PGRNX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Global Environmental Markets Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/GEM. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/GEM
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$117
1.14%
Expenses Paid, Amount $ 117
Expense Ratio, Percent 1.14%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Global Environmental Markets Fund Investor Class $21,875
MSCI ACWI Index (Net) $24,183
FTSE Environmental Opportunities Index $31,456
Lipper Global Multi-Cap Core Funds Index $21,786
12/31/2014
$10,000
$10,000
$10,000
$10,000
12/31/2015
$9,855
$9,764
$9,808
$9,927
12/31/2016
$10,902
$10,531
$10,953
$10,760
12/31/2017
$13,782
$13,056
$14,350
$13,187
12/31/2018
$11,810
$11,827
$12,543
$11,768
12/31/2019
$15,086
$14,973
$16,498
$14,615
12/31/2020
$18,965
$17,406
$23,073
$16,843
12/31/2021
$23,128
$20,633
$27,794
$19,893
12/31/2022
$17,897
$16,844
$21,095
$16,336
12/31/2023
$20,859
$20,584
$26,937
$19,459
12/31/2024
$21,875
$24,183
$31,456
$21,786
Average Annual Return [Table Text Block]
1 Year
5 years
10 Years
Investor Class
4.87%
7.71%
8.14%
MSCI ACWI Index (Net)
17.49
10.06
9.23
FTSE Environmental Opportunities Index
16.78
13.78
12.14
Lipper Global Multi-Cap Core Funds Index
11.96
8.31
8.10
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 2,281,847,908
Holdings Count | Holding 45
Advisory Fees Paid, Amount $ 18,232,463
InvestmentCompanyPortfolioTurnover 30.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$2,281,847,908
Total Number of Portfolio Holdings
45
Total Investment Advisory Fees Paid During the Reporting Period
$18,232,463
Portfolio Turnover Rate
30%
Holdings [Text Block]
Company
Percent of Net Assets
Microsoft Corp.
4.4%
Agilent Technologies, Inc.
4.3%
Waste Management, Inc.
4.0%
Linde plc
4.0%
Waters Corp.
3.3%
Air Liquide SA
3.2%
Schneider Electric SE
3.0%
Siemens AG
2.8%
NVIDIA Corp.
2.7%
Texas Instruments, Inc.
2.6%
Value
Value
Other assets and liabilities (net)
0.9%
OthersFootnote Reference‡
0.9%
Jersey
1.3%
Netherlands
1.7%
Bermuda
2.0%
Ireland
2.1%
Taiwan
4.3%
United Kingdom
4.5%
France
5.6%
Switzerland
6.3%
Germany
6.3%
United States
64.1%
Value
Value
U.S. Stocks
64.0%
Foreign Stocks
35.1%
Cash & Cash Equivalents
0.9%
Material Fund Change [Text Block]

 

   

C000128849  
Shareholder Report [Line Items]  
Fund Name Impax Global Environmental Markets Fund
Class Name Class A
Trading Symbol PXEAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Global Environmental Markets Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/GEM. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/GEM
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$117
1.14%
Expenses Paid, Amount $ 117
Expense Ratio, Percent 1.14%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Global Environmental Markets Fund Class A $20,672
MSCI ACWI Index (Net) $24,183
FTSE Environmental Opportunities Index $31,456
Lipper Global Multi-Cap Core Funds Index $21,786
12/31/2014
$9,450
$10,000
$10,000
$10,000
12/31/2015
$9,314
$9,764
$9,808
$9,927
12/31/2016
$10,303
$10,531
$10,953
$10,760
12/31/2017
$13,029
$13,056
$14,350
$13,187
12/31/2018
$11,162
$11,827
$12,543
$11,768
12/31/2019
$14,261
$14,973
$16,498
$14,615
12/31/2020
$17,923
$17,406
$23,073
$16,843
12/31/2021
$21,847
$20,633
$27,794
$19,893
12/31/2022
$16,914
$16,844
$21,095
$16,336
12/31/2023
$19,718
$20,584
$26,937
$19,459
12/31/2024
$20,672
$24,183
$31,456
$21,786
Average Annual Return [Table Text Block]
1 Year
5 years
10 Years
Class A
4.84%
7.70%
8.14%
MSCI ACWI Index (Net)
17.49
10.06
9.23
FTSE Environmental Opportunities Index
16.78
13.78
12.14
Lipper Global Multi-Cap Core Funds Index
11.96
8.31
8.10
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 2,281,847,908
Holdings Count | Holding 45
Advisory Fees Paid, Amount $ 18,232,463
InvestmentCompanyPortfolioTurnover 30.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$2,281,847,908
Total Number of Portfolio Holdings
45
Total Investment Advisory Fees Paid During the Reporting Period
$18,232,463
Portfolio Turnover Rate
30%
Holdings [Text Block]
Company
Percent of Net Assets
Microsoft Corp.
4.4%
Agilent Technologies, Inc.
4.3%
Waste Management, Inc.
4.0%
Linde plc
4.0%
Waters Corp.
3.3%
Air Liquide SA
3.2%
Schneider Electric SE
3.0%
Siemens AG
2.8%
NVIDIA Corp.
2.7%
Texas Instruments, Inc.
2.6%
Value
Value
Other assets and liabilities (net)
0.9%
OthersFootnote Reference‡
0.9%
Jersey
1.3%
Netherlands
1.7%
Bermuda
2.0%
Ireland
2.1%
Taiwan
4.3%
United Kingdom
4.5%
France
5.6%
Switzerland
6.3%
Germany
6.3%
United States
64.1%
Value
Value
U.S. Stocks
64.0%
Foreign Stocks
35.1%
Cash & Cash Equivalents
0.9%
Material Fund Change [Text Block]

 

   

C000061358  
Shareholder Report [Line Items]  
Fund Name Impax Global Environmental Markets Fund
Class Name Institutional Class
Trading Symbol PGINX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Global Environmental Markets Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/GEM. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/GEM
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$91
0.89%
Expenses Paid, Amount $ 91
Expense Ratio, Percent 0.89%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Global Environmental Markets Fund (Institutional Class) $560,931
MSCI ACWI Index (Net) $604,586
FTSE Environmental Opportunities Index $786,399
Lipper Global Multi-Cap Core Funds Index $544,656
12/31/2014
$250,000
$250,000
$250,000
$250,000
12/31/2015
$246,978
$244,090
$245,189
$248,180
12/31/2016
$273,926
$263,286
$273,830
$269,001
12/31/2017
$347,302
$326,401
$358,759
$329,664
12/31/2018
$298,091
$295,673
$313,577
$294,189
12/31/2019
$382,051
$374,314
$412,451
$365,363
12/31/2020
$481,367
$435,158
$576,836
$421,070
12/31/2021
$588,362
$515,825
$694,838
$497,321
12/31/2022
$456,643
$421,099
$527,376
$408,394
12/31/2023
$533,599
$514,591
$673,424
$486,480
12/31/2024
$560,931
$604,586
$786,399
$544,656
Average Annual Return [Table Text Block]
1 Year
5 years
10 Years
Institutional Class
5.12%
7.97%
8.41%
MSCI ACWI Index (Net)
17.49
10.06
9.23
FTSE Environmental Opportunities Index
16.78
13.78
12.14
Lipper Global Multi-Cap Core Funds Index
11.96
8.31
8.10
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 2,281,847,908
Holdings Count | Holding 45
Advisory Fees Paid, Amount $ 18,232,463
InvestmentCompanyPortfolioTurnover 30.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$2,281,847,908
Total Number of Portfolio Holdings
45
Total Investment Advisory Fees Paid During the Reporting Period
$18,232,463
Portfolio Turnover Rate
30%
Holdings [Text Block]
Company
Percent of Net Assets
Microsoft Corp.
4.4%
Agilent Technologies, Inc.
4.3%
Waste Management, Inc.
4.0%
Linde plc
4.0%
Waters Corp.
3.3%
Air Liquide SA
3.2%
Schneider Electric SE
3.0%
Siemens AG
2.8%
NVIDIA Corp.
2.7%
Texas Instruments, Inc.
2.6%
Value
Value
Other assets and liabilities (net)
0.9%
OthersFootnote Reference‡
0.9%
Jersey
1.3%
Netherlands
1.7%
Bermuda
2.0%
Ireland
2.1%
Taiwan
4.3%
United Kingdom
4.5%
France
5.6%
Switzerland
6.3%
Germany
6.3%
United States
64.1%
Value
Value
U.S. Stocks
64.0%
Foreign Stocks
35.1%
Cash & Cash Equivalents
0.9%
Material Fund Change [Text Block]

 

   

C000246501  
Shareholder Report [Line Items]  
Fund Name Impax Global Social Leaders Fund
Class Name Investor Class
Trading Symbol IGSLX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Global Social Leaders Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/GSL. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/GSL
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$128
1.23%
Expenses Paid, Amount $ 128
Expense Ratio, Percent 1.23%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Global Social Leaders Fund Investor Class $11,437
MSCI ACWI Index (Net) $12,313
Lipper Global Multi-Cap Growth Funds Index $12,429
11/30/2023
10,000
10,000
10,000
12/31/2023
10,530
10,480
10,636
06/30/2024
11,007
11,665
11,625
12/31/2024
11,437
12,313
12,429
Average Annual Return [Table Text Block]
1 Year
Since Inception (11/30/23)
Investor Class - (Incorp November 30, 2023)
8.61%
13.19%
MSCI ACWI Index (Net)
17.49
21.18
Lipper Global Multi-Cap Growth Funds Index
16.85
22.13
Performance Inception Date Nov. 30, 2023
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 1,813,108
Holdings Count | Holding 45
Advisory Fees Paid, Amount $ 0
InvestmentCompanyPortfolioTurnover 30.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$1,813,108
Total Number of Portfolio Holdings
45
Total Investment Advisory Fees Paid During the Reporting Period
$-
Portfolio Turnover Rate
30%
Holdings [Text Block]
Company
Percent of Net Assets
NVIDIA Corp.
5.6%
eBay, Inc.
4.5%
Intuit, Inc.
4.0%
ServiceNow, Inc.
3.8%
Halma plc
3.5%
Recruit Holdings Co. Ltd.
3.4%
Alcon AG
3.2%
MercadoLibre, Inc.
3.0%
Legal & General Group plc
2.9%
Danone SA
2.7%
Value
Value
Other assets and liabilities (net)
3.2%
OthersFootnote Reference‡
8.8%
Ireland
1.6%
Sweden
1.7%
India
2.1%
France
2.7%
Brazil
3.0%
Japan
3.4%
Hong Kong
3.8%
Netherlands
4.6%
United Kingdom
10.1%
United States
55.0%
Value
Value
U.S. Stocks
54.1%
Foreign Stocks
41.1%
Cash & Cash Equivalents
4.8%
Material Fund Change [Text Block]

 

   

C000246502  
Shareholder Report [Line Items]  
Fund Name Impax Global Social Leaders Fund
Class Name Institutional Class
Trading Symbol IGSIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Global Social Leaders Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/GSL. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/GSL
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$102
0.98%
Expenses Paid, Amount $ 102
Expense Ratio, Percent 0.98%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax Global Social Leaders Fund (Institutional Class) $286,889
MSCI ACWI Index (Net) $307,830
Lipper Global Multi-Cap Growth Funds Index $310,713
11/30/2023
$250,000
$250,000
$250,000
12/31/2023
$263,500
$262,008
$265,911
06/30/2024
$275,591
$291,617
$290,635
12/31/2024
$286,889
$307,830
$310,713
Average Annual Return [Table Text Block]
1 Year
Since Inception (11/30/23)
Institutional Class - (Incorp November 30, 2023)
8.88%
13.55%
MSCI ACWI Index (Net)
17.49
21.18
Lipper Global Multi-Cap Growth Funds Index
16.85
22.13
Performance Inception Date Nov. 30, 2023
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 1,813,108
Holdings Count | Holding 45
Advisory Fees Paid, Amount $ 0
InvestmentCompanyPortfolioTurnover 30.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$1,813,108
Total Number of Portfolio Holdings
45
Total Investment Advisory Fees Paid During the Reporting Period
$-
Portfolio Turnover Rate
30%
Holdings [Text Block]
Company
Percent of Net Assets
NVIDIA Corp.
5.6%
eBay, Inc.
4.5%
Intuit, Inc.
4.0%
ServiceNow, Inc.
3.8%
Halma plc
3.5%
Recruit Holdings Co. Ltd.
3.4%
Alcon AG
3.2%
MercadoLibre, Inc.
3.0%
Legal & General Group plc
2.9%
Danone SA
2.7%
Value
Value
Other assets and liabilities (net)
3.2%
OthersFootnote Reference‡
8.8%
Ireland
1.6%
Sweden
1.7%
India
2.1%
France
2.7%
Brazil
3.0%
Japan
3.4%
Hong Kong
3.8%
Netherlands
4.6%
United Kingdom
10.1%
United States
55.0%
Value
Value
U.S. Stocks
54.1%
Foreign Stocks
41.1%
Cash & Cash Equivalents
4.8%
Material Fund Change [Text Block]

 

   

C000137562  
Shareholder Report [Line Items]  
Fund Name Impax International Sustainable Economy Fund
Class Name Investor Class
Trading Symbol PXINX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax International Sustainable Economy Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/ISE. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/ISE
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$71
0.70%
Expenses Paid, Amount $ 71
Expense Ratio, Percent 0.70%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax International Sustainable Economy Fund Investor Class $15,326
MSCI EAFE Index (Net) $15,785
MSCI EAFE ESG Leaders Index (Net) $15,977
Lipper International Large-Cap Core Funds Index $15,017
12/31/2014
$9,414
$9,510
$9,562
$9,522
12/31/2015
$9,499
$9,432
$9,783
$9,216
12/31/2016
$9,324
$9,527
$9,739
$9,459
12/31/2017
$11,469
$11,912
$12,015
$11,868
12/31/2018
$9,962
$10,269
$10,403
$10,038
12/31/2019
$12,231
$12,530
$12,888
$12,102
12/31/2020
$13,516
$13,509
$14,235
$12,712
12/31/2021
$14,987
$15,031
$15,842
$14,258
12/31/2022
$12,290
$12,858
$13,150
$12,340
12/31/2023
$14,615
$15,204
$15,625
$14,415
12/31/2024
$15,326
$15,785
$15,977
$15,017
Average Annual Return [Table Text Block]
1 Year
5 years
10 Years
Investor Class
4.87%
4.61%
4.99%
MSCI EAFE Index (Net)
3.82
4.73
5.20
MSCI EAFE ESG Leaders Index (Net)
2.25
4.37
5.26
Lipper International Large-Cap Core Funds Index
4.18
4.41
4.66
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 1,225,304,146
Holdings Count | Holding 140
Advisory Fees Paid, Amount $ 5,430,884
InvestmentCompanyPortfolioTurnover 46.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$1,225,304,146
Total Number of Portfolio Holdings
140
Total Investment Advisory Fees Paid During the Reporting Period
$5,430,884
Portfolio Turnover Rate
46%
Holdings [Text Block]
Company
Percent of Net Assets
Novartis AG
2.7%
AstraZeneca plc
2.4%
HSBC Holdings plc
2.3%
Schneider Electric SE
2.3%
Iberdrola SA
2.0%
ASML Holding NV
2.0%
Novo Nordisk A/S, B
2.0%
RELX plc
1.8%
Hitachi Ltd.
1.8%
BNP Paribas SA
1.8%
Value
Value
Other assets and liabilities (net)
2.2%
OthersFootnote Reference‡
14.9%
Denmark
3.2%
Sweden
3.6%
Netherlands
4.0%
United States
5.2%
Australia
5.8%
Switzerland
8.1%
France
8.3%
Germany
8.4%
United Kingdom
14.2%
Japan
22.1%
Value
Value
Foreign Stocks
93.2%
U.S. Stocks
5.2%
Cash & Cash Equivalents
1.6%
Material Fund Change [Text Block]

 

   

C000137561  
Shareholder Report [Line Items]  
Fund Name Impax International Sustainable Economy Fund
Class Name Institutional Class
Trading Symbol PXNIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax International Sustainable Economy Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/ISE. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/ISE
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$46
0.45%
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.45%
Line Graph [Table Text Block]
Growth of 10K Chart
Impax International Sustainable Economy Fund (Institutional Class) $394,188
MSCI EAFE Index (Net) $394,620
MSCI EAFE ESG Leaders Index (Net) $399,436
Lipper International Large-Cap Core Funds Index $375,434
12/31/2014
$236,284
$237,746
$239,054
$238,038
12/31/2015
$239,032
$235,810
$244,578
$230,390
12/31/2016
$235,131
$238,169
$243,478
$236,479
12/31/2017
$290,013
$297,793
$300,378
$296,697
12/31/2018
$252,591
$256,726
$260,084
$250,952
12/31/2019
$310,709
$313,243
$322,192
$302,551
12/31/2020
$344,195
$337,726
$355,875
$317,792
12/31/2021
$382,718
$375,765
$396,053
$356,443
12/31/2022
$314,611
$321,460
$328,750
$308,488
12/31/2023
$375,281
$380,088
$390,629
$360,378
12/31/2024
$394,188
$394,620
$399,436
$375,434
Average Annual Return [Table Text Block]
1 Year
5 years
10 Years
Institutional Class
5.04%
4.87%
5.25%
MSCI EAFE Index (Net)
3.82
4.73
5.20
MSCI EAFE ESG Leaders Index (Net)
2.25
4.37
5.26
Lipper International Large-Cap Core Funds Index
4.18
4.41
4.66
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 1,225,304,146
Holdings Count | Holding 140
Advisory Fees Paid, Amount $ 5,430,884
InvestmentCompanyPortfolioTurnover 46.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$1,225,304,146
Total Number of Portfolio Holdings
140
Total Investment Advisory Fees Paid During the Reporting Period
$5,430,884
Portfolio Turnover Rate
46%
Holdings [Text Block]
Company
Percent of Net Assets
Novartis AG
2.7%
AstraZeneca plc
2.4%
HSBC Holdings plc
2.3%
Schneider Electric SE
2.3%
Iberdrola SA
2.0%
ASML Holding NV
2.0%
Novo Nordisk A/S, B
2.0%
RELX plc
1.8%
Hitachi Ltd.
1.8%
BNP Paribas SA
1.8%
Value
Value
Other assets and liabilities (net)
2.2%
OthersFootnote Reference‡
14.9%
Denmark
3.2%
Sweden
3.6%
Netherlands
4.0%
United States
5.2%
Australia
5.8%
Switzerland
8.1%
France
8.3%
Germany
8.4%
United Kingdom
14.2%
Japan
22.1%
Value
Value
Foreign Stocks
93.2%
U.S. Stocks
5.2%
Cash & Cash Equivalents
1.6%
Material Fund Change [Text Block]

 

   

C000175863  
Shareholder Report [Line Items]  
Fund Name Impax Core Bond Fund
Class Name Investor Class
Trading Symbol PAXBX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Core Bond Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/CB. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/CB
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$72
0.72%
Expenses Paid, Amount $ 72
Expense Ratio, Percent 0.72%
Average Annual Return [Table Text Block]

Average Annual Total Returns as of December 31, 2024

1 Year
5 years
Since Inception (12/16/16)
Investor Class - (Incorp December 16, 2016)
1.33%
-0.51%
1.01%
Bloomberg US Aggregate Bond Index
1.25
-0.33
1.29
Lipper Core Bond Funds Index
1.90
0.13
1.75

   

This performance line graph and table show the average annual total returns of the Fund for the past one-, five- and since inception periods ended December 31, 2024. It also shows the average annual total returns of a broad-based securities market index and a secondary, narrower index over the same periods. This table does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. The Fund's past performance is not a good indicative of future results of the Fund's future performance. For most recent month-end performance data, please visit www.impaxam.com or call 800.767.1729.
Performance Inception Date Dec. 16, 2016
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 835,401,072
Holdings Count | Holding 455
Advisory Fees Paid, Amount $ 3,495,648
InvestmentCompanyPortfolioTurnover 124.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$835,401,072
Total Number of Portfolio Holdings
455
Total Investment Advisory Fees Paid During the Reporting Period
$3,495,648
Portfolio Turnover Rate
124%
Holdings [Text Block]
Value
Value
Other assets and liabilities (net)
2.0%
Community Investment Notes
0.0%Footnote Reference#
Loans
0.4%
Municipal Bonds
0.8%
Foreign Government and Agency Securities
1.8%
Asset-Backed Securities
5.1%
Supranational
5.3%
U.S. Government and Agency Securities
20.4%
Corporate Bonds
30.2%
Mortgage-Backed Securities
34.0%
Value
Value
U.S. Bonds
88.5%
Supranational
5.3%
Foreign Bonds
3.5%
Cash & Cash Equivalents
2.1%
Loans
0.5%
Community Investment Notes
0.1%
U.S. Government
21.2%
AAA
7.1%
AA
4.4%
A
11.2%
BBB
14.6%
BB or lower
3.3%
N/R (Not Rated)
38.2%
Largest Holdings [Text Block]
Company
Percent of Net Assets
U.S. Treasury Notes, 3.875%, 10/15/27
7.0%
U.S. Treasury Notes, 3.500%, 9/30/29
4.4%
U.S. Treasury Bonds, 4.250%, 8/15/54
3.3%
U.S. Treasury Bonds, 4.125%, 8/15/44
2.7%
U.S. Treasury Notes, 4.125%, 10/31/26
1.0%
FHLMC Pool, 30 Year, 5.500%, 1/01/54
0.7%
Kreditanstalt fuer Wiederaufbau, 0.625%, 1/22/26
0.6%
International Bank for Reconstruction & Development, 0.00%, 3/31/28
0.5%
GNMA II, Single-family, 30 Year, 2.500%, 8/20/52
0.5%
GNMA II, Single-family, 30 Year, 3.000%, 6/20/53
0.5%
Material Fund Change [Text Block]

   

   

C000175862  
Shareholder Report [Line Items]  
Fund Name Impax Core Bond Fund
Class Name Institutional Class
Trading Symbol PXBIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Core Bond Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/CB. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/CB
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$47
0.47%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.47%
Average Annual Return [Table Text Block]

Average Annual Total Returns as of December 31, 2024

1 Year
5 years
Since Inception (12/16/16)
Institutional Class - (Incorp December 16, 2016)
1.46%
-0.28%
1.25%
Bloomberg US Aggregate Bond Index
1.25
-0.33
1.29
Lipper Core Bond Funds Index
1.90
0.13
1.75

   

This performance line graph and table show the average annual total returns of the Fund for the past one-, five- and since inception periods ended December 31, 2024. It also shows the average annual total returns of a broad-based securities market index and a secondary, narrower index over the same periods. This table does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. The Fund's past performance is not a good indicative of future results of the Fund's future performance. For most recent month-end performance data, please visit www.impaxam.com or call 800.767.1729.
Performance Inception Date Dec. 16, 2016
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 835,401,072
Holdings Count | Holding 455
Advisory Fees Paid, Amount $ 3,495,648
InvestmentCompanyPortfolioTurnover 124.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$835,401,072
Total Number of Portfolio Holdings
455
Total Investment Advisory Fees Paid During the Reporting Period
$3,495,648
Portfolio Turnover Rate
124%
Holdings [Text Block]
Value
Value
Other assets and liabilities (net)
2.0%
Community Investment Notes
0.0%Footnote Reference#
Loans
0.4%
Municipal Bonds
0.8%
Foreign Government and Agency Securities
1.8%
Asset-Backed Securities
5.1%
Supranational
5.3%
U.S. Government and Agency Securities
20.4%
Corporate Bonds
30.2%
Mortgage-Backed Securities
34.0%
Value
Value
U.S. Bonds
88.5%
Supranational
5.3%
Foreign Bonds
3.5%
Cash & Cash Equivalents
2.1%
Loans
0.5%
Community Investment Notes
0.1%
U.S. Government
21.2%
AAA
7.1%
AA
4.4%
A
11.2%
BBB
14.6%
BB or lower
3.3%
N/R (Not Rated)
38.2%
Largest Holdings [Text Block]
Company
Percent of Net Assets
U.S. Treasury Notes, 3.875%, 10/15/27
7.0%
U.S. Treasury Notes, 3.500%, 9/30/29
4.4%
U.S. Treasury Bonds, 4.250%, 8/15/54
3.3%
U.S. Treasury Bonds, 4.125%, 8/15/44
2.7%
U.S. Treasury Notes, 4.125%, 10/31/26
1.0%
FHLMC Pool, 30 Year, 5.500%, 1/01/54
0.7%
Kreditanstalt fuer Wiederaufbau, 0.625%, 1/22/26
0.6%
International Bank for Reconstruction & Development, 0.00%, 3/31/28
0.5%
GNMA II, Single-family, 30 Year, 2.500%, 8/20/52
0.5%
GNMA II, Single-family, 30 Year, 3.000%, 6/20/53
0.5%
Material Fund Change [Text Block]

   

   

C000043226  
Shareholder Report [Line Items]  
Fund Name Impax High Yield Bond Fund
Class Name Investor Class
Trading Symbol PAXHX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax High Yield Bond Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/HYB. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/HYB
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$96
0.93%
Expenses Paid, Amount $ 96
Expense Ratio, Percent 0.93%
Average Annual Return [Table Text Block]

Average Annual Total Returns as of December 31, 2024

1 Year
5 years
10 Years
Investor Class
6.06%
2.64%
3.70%
Bloomberg US Aggregate Bond IndexFootnote Reference*
1.25
-0.33
1.35
ICE BofA Merrill Lynch U.S. High Yield Cash Pay BB-B (Constrained 2%) Index
6.83
3.63
4.86

* As of July 2024, the Fund added the Bloomberg US Aggregate Bond Index as its new broad-based securities market benchmark in accordance with new regulatory disclosure requirements.  The ICE BofA Merrill Lynch U.S. High Yield Cash Pay BB-B (Constrained 2%) Index is included for comparative purposes because it more closely reflects the market segments in which the Fund invests.

This performance line graph and table show the average annual total returns of the Fund for the past one-, five- and ten-year periods ended December 31, 2024. It also shows the average annual total returns of a broad-based securities market index and a secondary, narrower index over the same periods. This table does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. The Fund's past performance is not indicative of future result of the Fund's future performance. For most recent month-end performance data, please visit www.impaxam.com or call 800.767.1729.
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 541,242,944
Holdings Count | Holding 220
Advisory Fees Paid, Amount $ 2,697,622
InvestmentCompanyPortfolioTurnover 61.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$541,242,944
Total Number of Portfolio Holdings
220
Total Investment Advisory Fees Paid During the Reporting Period
$2,697,622
Portfolio Turnover Rate
61%
Holdings [Text Block]
Value
Value
Other assets and liabilities (net)
2.5%
OthersFootnote Reference†
19.0%
Consumer Goods
5.5%
Real Estate
5.7%
Technology & Electronics
6.2%
Telecommunications
6.4%
Capital Goods
6.5%
Services
8.3%
Retail
8.6%
Basic Industry
8.8%
Healthcare
10.4%
Media
12.1%
Value
Value
U.S. Bonds
78.6%
Foreign Bonds
8.9%
Loans
7.7%
Cash & Cash Equivalents
4.4%
U.S. Stocks
0.2%
Community Investment Notes
0.2%
Foreign Stocks
0.0%Footnote Reference#
A
0.6%
BBB
3.0%
BB or lower
86.9%
N/R (Not Rated)
9.5%
Largest Holdings [Text Block]
Company
Percent of Net Assets
Medline Borrower LP, First Lien, Dollar Incremental CME Term Loan, 6.607%, 10/23/28
1.5%
Hilton Domestic Operating Co., Inc., 6.125%, 4/01/32
1.3%
Alliant Holdings Intermediate LLC / Alliant Holdings Co-Issuer, 7.000%, 1/15/31
1.2%
CCO Holdings LLC / CCO Holdings Capital Corp., 4.750%, 3/01/30
1.1%
Liberty Mutual Group, Inc., 4.125%, 12/15/51
1.1%
Avantor Funding, Inc., 4.625%, 7/15/28
1.0%
CVS Health Corp., 6.125%, 9/15/39
0.9%
Victoria's Secret & Co., 4.625%, 7/15/29
0.8%
Cogent Communications Group LLC, 7.000%, 6/15/27
0.8%
Imola Merger Corp., 4.750%, 5/15/29
0.8%
Material Fund Change [Text Block]

Material Fund Changes

Effective October 28, 2024, Impax High Yield Bond Fund imposed a redemption fee of 2.00% of Net Assets on shares redeemed within 30 days of purchase. The redemption fee applies to exchanges for shares of other Impax Funds as well as to redemptions for cash.
C000128847  
Shareholder Report [Line Items]  
Fund Name Impax High Yield Bond Fund
Class Name Class A
Trading Symbol PXHAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax High Yield Bond Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/HYB. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/HYB
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$96
0.93%
Expenses Paid, Amount $ 96
Expense Ratio, Percent 0.93%
Average Annual Return [Table Text Block]

Average Annual Total Returns as of December 31, 2024

1 Year
5 years
10 Years
Class A
6.06%
2.64%
3.70%
Bloomberg US Aggregate Bond IndexFootnote Reference*
1.25
-0.33
1.35
ICE BofA Merrill Lynch U.S. High Yield Cash Pay BB-B (Constrained 2%) Index
6.83
3.63
4.86

* As of July 2024, the Fund added the Bloomberg US Aggregate Bond Index as its new broad-based securities market benchmark in accordance with new regulatory disclosure requirements.  The ICE BofA Merrill Lynch U.S. High Yield Cash Pay BB-B (Constrained 2%) Index is included for comparative purposes because it more closely reflects the market segments in which the Fund invests.

This performance line graph and table show the average annual total returns of the Fund for the past one-, five- and ten-year periods ended December 31, 2024. It also shows the average annual total returns of a broad-based securities market index and a secondary, narrower index over the same periods. This table does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. The Fund's past performance is not indicative of future result of the Fund's future performance. For most recent month-end performance data, please visit www.impaxam.com or call 800.767.1729.
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 541,242,944
Holdings Count | Holding 220
Advisory Fees Paid, Amount $ 2,697,622
InvestmentCompanyPortfolioTurnover 61.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$541,242,944
Total Number of Portfolio Holdings
220
Total Investment Advisory Fees Paid During the Reporting Period
$2,697,622
Portfolio Turnover Rate
61%
Holdings [Text Block]
Value
Value
Other assets and liabilities (net)
2.5%
OthersFootnote Reference†
19.0%
Consumer Goods
5.5%
Real Estate
5.7%
Technology & Electronics
6.2%
Telecommunications
6.4%
Capital Goods
6.5%
Services
8.3%
Retail
8.6%
Basic Industry
8.8%
Healthcare
10.4%
Media
12.1%
Value
Value
U.S. Bonds
78.6%
Foreign Bonds
8.9%
Loans
7.7%
Cash & Cash Equivalents
4.4%
U.S. Stocks
0.2%
Community Investment Notes
0.2%
Foreign Stocks
0.0%Footnote Reference#
A
0.6%
BBB
3.0%
BB or lower
86.9%
N/R (Not Rated)
9.5%
Largest Holdings [Text Block]
Company
Percent of Net Assets
Medline Borrower LP, First Lien, Dollar Incremental CME Term Loan, 6.607%, 10/23/28
1.5%
Hilton Domestic Operating Co., Inc., 6.125%, 4/01/32
1.3%
Alliant Holdings Intermediate LLC / Alliant Holdings Co-Issuer, 7.000%, 1/15/31
1.2%
CCO Holdings LLC / CCO Holdings Capital Corp., 4.750%, 3/01/30
1.1%
Liberty Mutual Group, Inc., 4.125%, 12/15/51
1.1%
Avantor Funding, Inc., 4.625%, 7/15/28
1.0%
CVS Health Corp., 6.125%, 9/15/39
0.9%
Victoria's Secret & Co., 4.625%, 7/15/29
0.8%
Cogent Communications Group LLC, 7.000%, 6/15/27
0.8%
Imola Merger Corp., 4.750%, 5/15/29
0.8%
Material Fund Change [Text Block]

Material Fund Changes

Effective October 28, 2024, Impax High Yield Bond Fund imposed a redemption fee of 2.00% of Net Assets on shares redeemed within 30 days of purchase. The redemption fee applies to exchanges for shares of other Impax Funds as well as to redemptions for cash.
C000043227  
Shareholder Report [Line Items]  
Fund Name Impax High Yield Bond Fund
Class Name Institutional Class
Trading Symbol PXHIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax High Yield Bond Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/HYB. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/HYB
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$70
0.68%
Expenses Paid, Amount $ 70
Expense Ratio, Percent 0.68%
Average Annual Return [Table Text Block]

Average Annual Total Returns as of December 31, 2024

1 Year
5 years
10 Years
Institutional Class
6.33%
2.91%
3.95%
Bloomberg US Aggregate Bond IndexFootnote Reference*
1.25
-0.33
1.35
ICE BofA Merrill Lynch U.S. High Yield Cash Pay BB-B (Constrained 2%) Index
6.83
3.63
4.86

* As of July 2024, the Fund added the Bloomberg US Aggregate Bond Index as its new broad-based securities market benchmark in accordance with new regulatory disclosure requirements.  The ICE BofA Merrill Lynch U.S. High Yield Cash Pay BB-B (Constrained 2%) Index is included for comparative purposes because it more closely reflects the market segments in which the Fund invests.

This performance line graph and table show the average annual total returns of the Fund for the past one-, five- and ten-year periods ended December 31, 2024. It also shows the average annual total returns of a broad-based securities market index and a secondary, narrower index over the same periods. This table does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. The Fund's past performance is not indicative of future result of the Fund's future performance. For most recent month-end performance data, please visit www.impaxam.com or call 800.767.1729.
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 541,242,944
Holdings Count | Holding 220
Advisory Fees Paid, Amount $ 2,697,622
InvestmentCompanyPortfolioTurnover 61.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$541,242,944
Total Number of Portfolio Holdings
220
Total Investment Advisory Fees Paid During the Reporting Period
$2,697,622
Portfolio Turnover Rate
61%
Holdings [Text Block]
Value
Value
Other assets and liabilities (net)
2.5%
OthersFootnote Reference†
19.0%
Consumer Goods
5.5%
Real Estate
5.7%
Technology & Electronics
6.2%
Telecommunications
6.4%
Capital Goods
6.5%
Services
8.3%
Retail
8.6%
Basic Industry
8.8%
Healthcare
10.4%
Media
12.1%
Value
Value
U.S. Bonds
78.6%
Foreign Bonds
8.9%
Loans
7.7%
Cash & Cash Equivalents
4.4%
U.S. Stocks
0.2%
Community Investment Notes
0.2%
Foreign Stocks
0.0%Footnote Reference#
A
0.6%
BBB
3.0%
BB or lower
86.9%
N/R (Not Rated)
9.5%
Largest Holdings [Text Block]
Company
Percent of Net Assets
Medline Borrower LP, First Lien, Dollar Incremental CME Term Loan, 6.607%, 10/23/28
1.5%
Hilton Domestic Operating Co., Inc., 6.125%, 4/01/32
1.3%
Alliant Holdings Intermediate LLC / Alliant Holdings Co-Issuer, 7.000%, 1/15/31
1.2%
CCO Holdings LLC / CCO Holdings Capital Corp., 4.750%, 3/01/30
1.1%
Liberty Mutual Group, Inc., 4.125%, 12/15/51
1.1%
Avantor Funding, Inc., 4.625%, 7/15/28
1.0%
CVS Health Corp., 6.125%, 9/15/39
0.9%
Victoria's Secret & Co., 4.625%, 7/15/29
0.8%
Cogent Communications Group LLC, 7.000%, 6/15/27
0.8%
Imola Merger Corp., 4.750%, 5/15/29
0.8%
Material Fund Change [Text Block]

Material Fund Changes

Effective October 28, 2024, Impax High Yield Bond Fund imposed a redemption fee of 2.00% of Net Assets on shares redeemed within 30 days of purchase. The redemption fee applies to exchanges for shares of other Impax Funds as well as to redemptions for cash.
C000043250  
Shareholder Report [Line Items]  
Fund Name Impax Sustainable Allocation Fund
Class Name Investor Class
Trading Symbol PAXWX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Sustainable Allocation Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/SA. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/SA
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$31
0.30%
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.30%
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 2,303,007,720
Holdings Count | Holding 10
Advisory Fees Paid, Amount $ 1,165,950
InvestmentCompanyPortfolioTurnover 9.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$2,303,007,720
Total Number of Portfolio Holdings
10
Total Investment Advisory Fees Paid During the Reporting Period
$1,165,950
Portfolio Turnover Rate
9%
Holdings [Text Block]

Asset Allocation as of December 31, 2024Footnote Reference ^

Group By Industry Chart
Value
Value
Affiliated Investment Companies
98.5%
Cash & Cash Equivalents
1.5%
FootnoteDescription
Footnote ^
Percent of Investments.
Largest Holdings [Text Block]

Affiliated Investment Companies as of December 31, 2024

Percent of Net Assets
Impax Large Cap Fund
41.5%
Impax Core Bond Fund
31.9%
Impax Small Cap Fund
4.9%
Impax High Yield Bond Fund
4.8%
Impax International Sustainable Economy Fund
4.2%
Impax Global Opportunities Fund
3.0%
Impax Ellevate Global Women's Leadership Fund
2.8%
Impax Global Environmental Markets Fund
2.7%
Impax Global Sustainable Infrastructure Fund
2.5%
Material Fund Change [Text Block]
C000043251  
Shareholder Report [Line Items]  
Fund Name Impax Sustainable Allocation Fund
Class Name Institutional Class
Trading Symbol PAXIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Impax Sustainable Allocation Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block]  You can find additional information about the Fund at https://impaxam.com/SA. You can also request this information by contacting us at (800) 372-7827.
Additional Information Phone Number (800) 372-7827
Additional Information Website https://impaxam.com/SA
Expenses [Text Block]

What were the Fund's costs for the year? 

(based on a hypothetical $10,000 investment) 

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$5
0.05%
Expenses Paid, Amount $ 5
Expense Ratio, Percent 0.05%
Previous Investment Adviser [Text Block] December 31, 2024
AssetsNet $ 2,303,007,720
Holdings Count | Holding 10
Advisory Fees Paid, Amount $ 1,165,950
InvestmentCompanyPortfolioTurnover 9.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of December 31, 2024

Net Assets
$2,303,007,720
Total Number of Portfolio Holdings
10
Total Investment Advisory Fees Paid During the Reporting Period
$1,165,950
Portfolio Turnover Rate
9%
Holdings [Text Block]

Asset Allocation as of December 31, 2024Footnote Reference ^

Group By Industry Chart
Value
Value
Affiliated Investment Companies
98.5%
Cash & Cash Equivalents
1.5%
FootnoteDescription
Footnote ^
Percent of Investments.
Largest Holdings [Text Block]

Affiliated Investment Companies as of December 31, 2024

Percent of Net Assets
Impax Large Cap Fund
41.5%
Impax Core Bond Fund
31.9%
Impax Small Cap Fund
4.9%
Impax High Yield Bond Fund
4.8%
Impax International Sustainable Economy Fund
4.2%
Impax Global Opportunities Fund
3.0%
Impax Ellevate Global Women's Leadership Fund
2.8%
Impax Global Environmental Markets Fund
2.7%
Impax Global Sustainable Infrastructure Fund
2.5%
Material Fund Change [Text Block]