Condensed Consolidated Statements of Changes in Unitholders' Capital (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Paid-in Capital [Member]	Mar. 31, 2012 Paid-in Capital [Member]	Mar. 31, 2013 Accumulated Deficit [Member]	Mar. 31, 2012 Accumulated Deficit [Member]	Mar. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Mar. 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member]	Mar. 31, 2013 OCGH Non-Controlling Interest in Consolidated Subsidiaries [Member]	Mar. 31, 2012 OCGH Non-Controlling Interest in Consolidated Subsidiaries [Member]	Mar. 31, 2013 Common Class A [Member]	Mar. 31, 2012 Common Class A [Member]	Mar. 31, 2013 Class B Units [Member]	Mar. 31, 2012 Class B Units [Member]	Mar. 31, 2013 Common Class C [Member]	Dec. 31, 2012 Common Class C [Member]	Mar. 31, 2012 Common Class C [Member]	Dec. 31, 2011 Common Class C [Member]
Unitholders' capital, value	$ 1,393,893	$ 1,124,000	$ 645,053	$ 634,739	$ (336,903)	$ (444,713)	$ (1,748)	$ (1,884)	$ 1,087,491	$ 935,858
Unitholders' capital, shares											30,181	22,664	120,268	125,847	0	0	13	13
Activity for the nine months ended September 30, 2011:
Issuance of units, Shares	0	0	0	0							8	14	522	2,313
Cancellation of Class B units													26	15
Forfeitures of Class B units														(5)
Repurchase and cancellation of OCGH units	(833)	(675)							(833)	(675)			0
Equity reallocation between controlling and non-controlling interests			(887)	(2,472)					887	2,472
Capital increase related to equity-based compensation	6,452	12,189	1,292	1,839					5,160	10,350
Distributions declared	(184,430)	(87,767)	(31,690)	(9,528)					(152,740)	(78,239)
Net income	319,583	153,498			57,566	18,608			262,017	134,890
Foreign currency translation adjustment, net of tax	(3,339)	849					(670)	131	(2,669)	718
Unrealized gain on interest-rate swap designated as cash-flow hedge, net of tax	540	145					108	22	432	123
Unitholders' capital, value	$ 1,531,866	$ 1,202,239	$ 613,768	$ 624,578	$ (279,337)	$ (426,105)	$ (2,310)	$ (1,731)	$ 1,199,745	$ 1,005,497
Unitholders' capital, shares											30,189	22,678	120,764	128,140	0	0	13	13