Investments in Real Estate - Summary of Acquired Wholly Owned Industrial Properties (Detail) $ in Thousands		3 Months Ended	4 Months Ended	6 Months Ended		12 Months Ended
	Mar. 05, 2020 building shares	Jun. 30, 2020 USD ($) a ft² building	Jun. 19, 2020 USD ($) building	Jun. 30, 2020 USD ($) ft² building	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Real Estate [Line Items]
Rentable Square Feet | ft²		1,197,073		1,197,073
Number of Buildings | building		33		33
Acquisition Purchase Price		$ 283,853		$ 283,853
Assumption of debt in connection with acquisition of real estate including loan premium				48,759	$ 0
Noncontrolling Interests | Operating Partnership
Real Estate [Line Items]
Limited Partners' Capital Account, Units Issued | shares	1,406,170
Properties Acquired on March 5, 2020 and June 19, 2020
Real Estate [Line Items]
Number of Buildings | building	10		1
Acquisition Purchase Price		$ 214,200		214,200
Purchase price				$ 60,400
Payments for Deposits on Real Estate Acquisitions						$ 10,000
Properties Acquired on March 5, 2020 and June 19, 2020 | Series 2 CPOP Units
Real Estate [Line Items]
Acquisition, preferred units issued (in units) | shares	906,374
Preferred Unit, Distribution Rate, Percentage	4.00%
Properties Acquired on March 5, 2020 and June 19, 2020 | Secured Debt
Real Estate [Line Items]
Assumption of debt in connection with acquisition of real estate including loan premium			$ 47,500
701-751 Kingshill Place(2)
Real Estate [Line Items]
Date of Acquisition				Mar. 05, 2020
Rentable Square Feet | ft²		169,069		169,069
Number of Buildings | building		6		6
Acquisition Purchase Price		$ 33,251		$ 33,251
2601-2641 Manhattan Beach Boulevard(2)
Real Estate [Line Items]
Date of Acquisition				Mar. 05, 2020
Rentable Square Feet | ft²		126,726		126,726
Number of Buildings | building		6		6
Acquisition Purchase Price		$ 39,481		$ 39,481
2410-2420 Santa Fe Avenue(2)
Real Estate [Line Items]
Date of Acquisition				Mar. 05, 2020
Rentable Square Feet | ft²		112,000		112,000
Number of Buildings | building		1		1
Acquisition Purchase Price		$ 35,737		$ 35,737
11600 Los Nietos Road(2)
Real Estate [Line Items]
Date of Acquisition				Mar. 05, 2020
Rentable Square Feet | ft²		103,982		103,982
Number of Buildings | building		1		1
Acquisition Purchase Price		$ 16,626		$ 16,626
5160 Richton Street(2)
Real Estate [Line Items]
Date of Acquisition				Mar. 05, 2020
Rentable Square Feet | ft²		94,976		94,976
Number of Buildings | building		1		1
Acquisition Purchase Price		$ 15,653		$ 15,653
2205 126th Street(2)
Real Estate [Line Items]
Date of Acquisition				Mar. 05, 2020
Rentable Square Feet | ft²		63,532		63,532
Number of Buildings | building		1		1
Acquisition Purchase Price		$ 17,712		$ 17,712
11832-11954 La Cienega Boulevard(2)
Real Estate [Line Items]
Date of Acquisition				Mar. 05, 2020
Rentable Square Feet | ft²		63,462		63,462
Number of Buildings | building		4		4
Acquisition Purchase Price		$ 19,664		$ 19,664
7612-7642 Woodwind Drive(2)
Real Estate [Line Items]
Date of Acquisition				Mar. 05, 2020
Rentable Square Feet | ft²		62,377		62,377
Number of Buildings | building		3		3
Acquisition Purchase Price		$ 13,780		$ 13,780
960-970 Knox Street(2)
Real Estate [Line Items]
Date of Acquisition				Mar. 05, 2020
Rentable Square Feet | ft²		39,400		39,400
Number of Buildings | building		1		1
Acquisition Purchase Price		$ 9,939		$ 9,939
25781 Atlantic Ocean Drive(2)
Real Estate [Line Items]
Date of Acquisition				Mar. 05, 2020
Rentable Square Feet | ft²		27,960		27,960
Number of Buildings | building		1		1
Acquisition Purchase Price		$ 5,516		$ 5,516
Brady Way
Real Estate [Line Items]
Date of Acquisition				Apr. 01, 2020
Rentable Square Feet | ft²		0		0
Number of Buildings | building		0		0
Acquisition Purchase Price		$ 874		$ 874
Number Of Acres | a		1
720-750 Vernon Avenue
Real Estate [Line Items]
Date of Acquisition				Apr. 03, 2020
Rentable Square Feet | ft²		71,692		71,692
Number of Buildings | building		3		3
Acquisition Purchase Price		$ 15,515		$ 15,515
6687 Flotilla Street
Real Estate [Line Items]
Date of Acquisition				May 05, 2020
Rentable Square Feet | ft²		120,000		120,000
Number of Buildings | building		1		1
Acquisition Purchase Price		$ 21,000		$ 21,000
1055 Sandhill Avenue
Real Estate [Line Items]
Date of Acquisition				May 28, 2020
Rentable Square Feet | ft²		0		0
Number of Buildings | building		0		0
Acquisition Purchase Price		$ 14,453		$ 14,453
22895 Eastpark Drive(7)
Real Estate [Line Items]
Date of Acquisition				Jun. 19, 2020
Rentable Square Feet | ft²		34,950		34,950
Number of Buildings | building		1		1
Acquisition Purchase Price		$ 6,844		$ 6,844
8745-8775 Production Avenue
Real Estate [Line Items]
Date of Acquisition				Jun. 19, 2020
Rentable Square Feet | ft²		46,820		46,820
Number of Buildings | building		2		2
Acquisition Purchase Price		$ 7,850		$ 7,850
15580 Slover Avenue
Real Estate [Line Items]
Date of Acquisition				Jun. 26, 2020
Rentable Square Feet | ft²		60,127		60,127
Number of Buildings | building		1		1
Acquisition Purchase Price		$ 9,958		$ 9,958