Consolidating Financial Information of Guarantors and Issuers Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 31, 2014	Jun. 29, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 35,447	$ 131,840	$ 40,134	$ 118,056
Receivables	70,019	27,395	66,561
Inventories	46,627	25,883	45,571
Current deferred tax asset	20,032	9,265	22,900
Other current assets	29,804	9,334	31,398
Total current assets	201,929	203,717	206,564
Property and equipment (net)	1,574,731	1,526,551	1,557,164
Investment In Park	0	0	0
Goodwill	221,662	228,291	237,650	238,089
Other intangibes, net	37,278	38,191	39,509
Deferred Tax Asset	0	0	0
Other Assets	40,678	41,569	44,909
Total Assets	2,076,278	2,038,319	2,085,796
Current Liabilities:
Current maturities of long-term debt	0	0	3,025
Accounts payable	39,917	23,933	37,503
Deferred revenue	147,943	61,161	133,797
Accrued interest	12,455	9,916	12,516
Accrued taxes	12,143	21,800	7,253
Accrued salaries, wages and benefits	32,233	34,102	35,640
Self-insurance reserves	24,020	23,377	23,659
Current derivative liability	6,895	11,791	0
Other accrued liabilities	15,433	12,139	9,405
Total current liabilities	291,039	198,219	262,798
Deferred Tax Liability	153,053	152,513	157,046
Derivative Liability	18,806	14,649	30,110
Other Liabilities	16,061	17,871	7,402
Long-Term Debt:
Long-term Line of Credit, Noncurrent	42,000	0	39,000
Term debt	608,850	608,850	615,825
Notes	950,000	950,000	950,000
Total long-term debt	1,600,850	1,558,850	1,604,825
Equity	(3,531)	96,217	23,615
Total Partners' Equity and Liabilities	2,076,278	2,038,319	2,085,796
Cedar Fair L.P. (Parent) [Member]
Current Assets:
Cash and cash equivalents	0	80,000	0	75,000
Receivables	1	8	59
Inventories	0	0	0
Current deferred tax asset	0	0	0
Other current assets	434	680	691
Total current assets	435	80,688	750
Property and equipment (net)	0	470,851	471,252
Investment In Park	663,494	544,340	466,213
Goodwill	674	9,061	9,061
Other intangibes, net	0	0	0
Deferred Tax Asset	0	0	0
Other Assets	5,176	10,615	11,680
Total Assets	669,779	1,115,555	958,956
Current Liabilities:
Current maturities of long-term debt			1,724
Accounts payable	311,822	352,518	218,225
Deferred revenue	0	0	0
Accrued interest	5,487	4,637	6,422
Accrued taxes	3,082	4,309	6,054
Accrued salaries, wages and benefits	0	0	0
Self-insurance reserves	0	0	0
Current derivative liability	4,127	7,062
Other accrued liabilities	0	508	376
Total current liabilities	324,518	369,034	232,801
Deferred Tax Liability	0	0	0
Derivative Liability	10,927	8,438	17,700
Other Liabilities	968	0	0
Long-Term Debt:
Long-term Line of Credit, Noncurrent	42,000		39,000
Term debt	0	346,969	350,943
Notes	294,897	294,897	294,897
Total long-term debt	336,897	641,866	684,840
Equity	(3,531)	96,217	23,615
Total Partners' Equity and Liabilities	669,779	1,115,555	958,956
Guarantor Subsidiaries Co Issuer Subsidiary Magnum [Member]
Current Assets:
Cash and cash equivalents	0	382	0	4,144
Receivables	108,653	143,931	104,035
Inventories	228	2,074	5,732
Current deferred tax asset	15,315	4,547	18,655
Other current assets	1,658	2,079	14,115
Total current assets	125,854	153,013	142,537
Property and equipment (net)	5,612	5,630	8,206
Investment In Park	814,861	812,549	767,266
Goodwill	0	0	0
Other intangibes, net	0	0	0
Deferred Tax Asset	24,287	24,827	32,025
Other Assets	20,184	20,874	21,649
Total Assets	990,798	1,016,893	971,683
Current Liabilities:
Current maturities of long-term debt			1,231
Accounts payable	213,778	203,895	233,203
Deferred revenue	592	60	636
Accrued interest	4,211	3,223	4,251
Accrued taxes	0	0	1,196
Accrued salaries, wages and benefits	22,318	25,851	23,850
Self-insurance reserves	7,925	5,386	5,534
Current derivative liability	2,768	4,729
Other accrued liabilities	4,587	8,134	5,554
Total current liabilities	256,179	251,278	275,455
Deferred Tax Liability	0	0	0
Derivative Liability	7,879	6,211	12,410
Other Liabilities	3,574	6,105	4,039
Long-Term Debt:
Long-term Line of Credit, Noncurrent	0		0
Term debt	247,890	247,890	250,730
Notes	205,103	205,103	205,103
Total long-term debt	452,993	452,993	455,833
Equity	270,173	300,306	223,946
Total Partners' Equity and Liabilities	990,798	1,016,893	971,683
Co-Issuer Subsidiary (Cedar Canada) [Member]
Current Assets:
Cash and cash equivalents	15,485	45,519	19,425	35,575
Receivables	119,015	85,838	93,286
Inventories	3,143	1,594	4,091
Current deferred tax asset	674	674	800
Other current assets	2,681	23,818	5,974
Total current assets	140,998	157,443	123,576
Property and equipment (net)	204,916	218,260	247,632
Investment In Park	164,516	163,904	149,180
Goodwill	101,383	108,012	117,371
Other intangibes, net	14,371	15,312	16,639
Deferred Tax Asset	0	0	0
Other Assets	7,405	8,034	9,276
Total Assets	633,589	670,965	663,674
Current Liabilities:
Current maturities of long-term debt			70
Accounts payable	3,983	32,691	15,070
Deferred revenue	16,235	4,592	15,824
Accrued interest	1,874	2,056	1,843
Accrued taxes	1,771	0	0
Accrued salaries, wages and benefits	1,989	1,103	2,303
Self-insurance reserves	1,456	1,565	1,772
Current derivative liability	0	0
Other accrued liabilities	1,067	122	1,095
Total current liabilities	28,375	42,129	37,977
Deferred Tax Liability	49,695	49,695	57,540
Derivative Liability	0	0	0
Other Liabilities	0	0	0
Long-Term Debt:
Long-term Line of Credit, Noncurrent	0		0
Term debt	13,991	13,991	14,152
Notes	450,000	450,000	450,000
Total long-term debt	463,991	463,991	464,152
Equity	91,528	115,150	104,005
Total Partners' Equity and Liabilities	633,589	670,965	663,674
Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	20,740	5,939	29,986	3,337
Receivables	637,007	634,112	571,632
Inventories	43,256	22,215	35,748
Current deferred tax asset	4,043	4,044	3,445
Other current assets	26,476	5,905	13,500
Total current assets	731,522	672,215	654,311
Property and equipment (net)	1,364,203	831,810	830,074
Investment In Park	24,292	43,659	32,308
Goodwill	119,605	111,218	111,218
Other intangibes, net	22,907	22,879	22,870
Deferred Tax Asset	0	0	117
Other Assets	7,913	2,046	2,304
Total Assets	2,270,442	1,683,827	1,653,202
Current Liabilities:
Current maturities of long-term debt			0
Accounts payable	305,769	271,323	282,733
Deferred revenue	131,116	56,509	117,337
Accrued interest	883	0	0
Accrued taxes	8,735	40,639	2,885
Accrued salaries, wages and benefits	7,926	7,148	9,487
Self-insurance reserves	14,639	16,426	16,353
Current derivative liability	0	0
Other accrued liabilities	9,779	3,375	2,380
Total current liabilities	478,847	395,420	431,175
Deferred Tax Liability	127,645	127,645	131,648
Derivative Liability	0	0	0
Other Liabilities	11,519	11,766	3,363
Long-Term Debt:
Long-term Line of Credit, Noncurrent	0		0
Term debt	346,969	0	0
Notes	0	0	0
Total long-term debt	346,969	0	0
Equity	1,305,462	1,148,996	1,087,016
Total Partners' Equity and Liabilities	2,270,442	1,683,827	1,653,202
Eliminations [Member]
Current Assets:
Cash and cash equivalents	(778)	0	(9,277)	$ 0
Receivables	(794,657)	(836,494)	(702,451)
Inventories	0	0	0
Current deferred tax asset	0	0	0
Other current assets	(1,445)	(23,148)	(2,882)
Total current assets	(796,880)	(859,642)	(714,610)
Property and equipment (net)	0	0	0
Investment In Park	(1,667,163)	(1,564,452)	(1,414,967)
Goodwill	0	0	0
Other intangibes, net	0	0	0
Deferred Tax Asset	(24,287)	(24,827)	(32,142)
Other Assets	0	0	0
Total Assets	(2,488,330)	(2,448,921)	(2,161,719)
Current Liabilities:
Current maturities of long-term debt			0
Accounts payable	(795,435)	(836,494)	(711,728)
Deferred revenue	0	0	0
Accrued interest	0	0	0
Accrued taxes	(1,445)	(23,148)	(2,882)
Accrued salaries, wages and benefits	0	0	0
Self-insurance reserves	0	0	0
Current derivative liability	0	0
Other accrued liabilities	0	0	0
Total current liabilities	(796,880)	(859,642)	(714,610)
Deferred Tax Liability	(24,287)	(24,827)	(32,142)
Derivative Liability	0	0	0
Other Liabilities	0	0	0
Long-Term Debt:
Long-term Line of Credit, Noncurrent	0		0
Term debt	0	0	0
Notes	0	0	0
Total long-term debt	0	0	0
Equity	(1,667,163)	(1,564,452)	(1,414,967)
Total Partners' Equity and Liabilities	$ (2,488,330)	$ (2,448,921)	$ (2,161,719)