Supplemental Condensed Consolidating Financial Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net cash (used in) provided by operating activities	$ 187,310	$ 187,511
Cash flows from investing activities:
Acquisitions of facilities and other related equipment	(248,436)	(45,422)
Purchases of property and equipment	(184,903)	(153,875)
Proceeds from disposition of ancillary operations		14,583
Proceeds from sale of property and equipment	748	7,587
Increase in other investments	(67,708)	(32,277)
Net cash used in investing activities	(500,299)	(209,404)
Cash flows from financing activities:
Proceeds from exercise of stock options	308	18,125
Repurchase of restricted stock shares for payroll tax withholding requirements	(9,032)
Deferred financing costs	(24,787)
Excess tax benefit relating to stock-based compensation	1,004	4,675
Proceeds from noncontrolling investors in joint ventures	0	863
Redemption of noncontrolling investments in joint ventures	(31,096)	(225)
Distributions to noncontrolling investors in joint ventures	(27,038)	(15,333)
Changes in intercompany balances with affiliates, net	0
Borrowings under credit agreements	4,315,011
Issuance of long-term debt	1,025,000
Proceeds from receivables facility	300,000
Repayments of long-term indebtedness	(5,236,948)	(14,665)
Net cash provided by (used in) financing activities	312,422	(6,560)
Net change in cash and cash equivalents	(567)	(28,453)
Cash and cash equivalents at beginning of period	129,865	299,169
Cash and cash equivalents at end of period	129,298	270,716
Parent Guarantor [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	(1,230)	(22,195)
Cash flows from investing activities:
Proceeds from disposition of ancillary operations	0
Cash flows from financing activities:
Proceeds from exercise of stock options	308	18,125
Repurchase of restricted stock shares for payroll tax withholding requirements	(9,032)
Excess tax benefit relating to stock-based compensation	1,004	4,675
Changes in intercompany balances with affiliates, net	8,950	(605)
Borrowings under credit agreements		0
Issuance of long-term debt		0
Proceeds from receivables facility		0
Net cash provided by (used in) financing activities	1,230	22,195
Net change in cash and cash equivalents	0
Cash and cash equivalents at beginning of period	0
Cash and cash equivalents at end of period	0
Issuer [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	(26,237)	(83,202)
Cash flows from investing activities:
Proceeds from disposition of ancillary operations	0
Increase in other investments	10,000
Net cash used in investing activities	10,000
Cash flows from financing activities:
Deferred financing costs	(24,787)
Changes in intercompany balances with affiliates, net	(58,772)	95,750
Borrowings under credit agreements	4,305,674
Issuance of long-term debt	1,025,000
Proceeds from receivables facility		0
Repayments of long-term indebtedness	(5,230,878)	(12,548)
Net cash provided by (used in) financing activities	16,237	83,202
Net change in cash and cash equivalents	0
Cash and cash equivalents at beginning of period	0
Cash and cash equivalents at end of period	0
Other Guarantors [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	251,923	311,077
Cash flows from investing activities:
Acquisitions of facilities and other related equipment	(252,977)	(10,727)
Purchases of property and equipment	(127,796)	(64,312)
Proceeds from disposition of ancillary operations	0	0
Proceeds from sale of property and equipment	688	473
Increase in other investments	(45,612)	(36,201)
Net cash used in investing activities	(425,697)	(110,767)
Cash flows from financing activities:
Changes in intercompany balances with affiliates, net	173,612	(191,179)
Borrowings under credit agreements	9,337
Issuance of long-term debt		0
Proceeds from receivables facility		0
Repayments of long-term indebtedness	(5,307)	(1,472)
Net cash provided by (used in) financing activities	177,642	(192,651)
Net change in cash and cash equivalents	3,868	27,659
Cash and cash equivalents at beginning of period	14,536	212,035
Cash and cash equivalents at end of period	18,404	239,694
Non-Guarantors [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	(37,146)	(38,169)
Cash flows from investing activities:
Acquisitions of facilities and other related equipment	4,541	(34,695)
Purchases of property and equipment	(57,107)	(89,563)
Proceeds from disposition of ancillary operations	0	14,583
Proceeds from sale of property and equipment	60	7,114
Increase in other investments	(32,096)	3,924
Net cash used in investing activities	(84,602)	(98,637)
Cash flows from financing activities:
Proceeds from noncontrolling investors in joint ventures		863
Redemption of noncontrolling investments in joint ventures	(31,096)	(225)
Distributions to noncontrolling investors in joint ventures	(27,038)	(15,333)
Changes in intercompany balances with affiliates, net	(123,790)	96,034
Borrowings under credit agreements		0
Issuance of long-term debt		0
Proceeds from receivables facility	300,000
Repayments of long-term indebtedness	(763)	(645)
Net cash provided by (used in) financing activities	117,313	80,694
Net change in cash and cash equivalents	(4,435)	(56,112)
Cash and cash equivalents at beginning of period	115,329	87,134
Cash and cash equivalents at end of period	110,894	31,022
Eliminations [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities
Cash flows from investing activities:
Acquisitions of facilities and other related equipment
Purchases of property and equipment
Proceeds from disposition of ancillary operations
Proceeds from sale of property and equipment
Increase in other investments
Net cash used in investing activities
Cash flows from financing activities:
Proceeds from exercise of stock options
Repurchase of restricted stock shares for payroll tax withholding requirements
Deferred financing costs
Excess tax benefit relating to stock-based compensation
Proceeds from noncontrolling investors in joint ventures
Redemption of noncontrolling investments in joint ventures
Distributions to noncontrolling investors in joint ventures
Changes in intercompany balances with affiliates, net
Borrowings under credit agreements	0	0
Issuance of long-term debt	0	0
Proceeds from receivables facility
Repayments of long-term indebtedness
Net cash provided by (used in) financing activities
Net change in cash and cash equivalents
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period