Supplemental Condensed Consolidating Financial Information (Schedule of Condensed Consolidating Statement of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net cash (used in) provided by operating activities	$ 482,927	$ 584,685
Cash flows from investing activities:
Acquisitions of facilities and other related equipment	(245,227)	(204,264)
Purchases of property and equipment	(386,461)	(351,383)
Proceeds from disposition of ancillary operations		18,464
Proceeds from sale of property and equipment	3,437	8,034
Increase in other investments	(162,316)	(75,211)
Net cash used in investing activities	(790,567)	(604,360)
Cash flows from financing activities:
Proceeds from exercise of stock options	1,269	18,831
Repurchase of restricted stock shares for payroll tax withholding requirements	(9,074)
Deferred financing costs	(63,986)	(234)
Excess tax benefit relating to stock-based compensation	1,037	4,659
Stock buy-back		(50,002)
Proceeds from noncontrolling investors in joint ventures	637	863
Redemption of noncontrolling investments in joint ventures	(35,888)	(3,303)
Distributions to noncontrolling investors in joint ventures	(34,590)	(30,078)
Borrowings under credit agreements	5,244,263
Issuance of long-term debt	1,025,000
Proceeds from receivables facility	300,000
Repayments of long-term indebtedness	(6,135,784)	(28,798)
Net cash provided by (used in) financing activities	292,884	(88,062)
Net change in cash and cash equivalents	(14,756)	(107,737)
Cash and cash equivalents at beginning of period	129,865	299,169
Cash and cash equivalents at end of period	115,109	191,432
Parent Company [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	(23,273)	1,490
Cash flows from financing activities:
Proceeds from exercise of stock options	1,269	18,831
Repurchase of restricted stock shares for payroll tax withholding requirements	(9,074)
Excess tax benefit relating to stock-based compensation	1,037	4,659
Stock buy-back		(50,002)
Changes in intercompany balances with affiliates, net	30,041	25,022
Net cash provided by (used in) financing activities	23,273	(1,490)
Subsidiary Issuer [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	(59,325)	(37,658)
Cash flows from financing activities:
Deferred financing costs	(63,986)	(234)
Changes in intercompany balances with affiliates, net	(16,362)	62,908
Borrowings under credit agreements	5,225,674
Issuance of long-term debt	1,025,000
Repayments of long-term indebtedness	(6,111,001)	(25,016)
Net cash provided by (used in) financing activities	59,325	37,658
Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	341,175	430,903
Cash flows from investing activities:
Acquisitions of facilities and other related equipment	(237,543)	(162,692)
Purchases of property and equipment	(252,067)	(189,425)
Proceeds from sale of property and equipment	1,460	881
Increase in other investments	(116,339)	(58,120)
Net cash used in investing activities	(604,489)	(409,356)
Cash flows from financing activities:
Changes in intercompany balances with affiliates, net	257,015	(157,450)
Borrowings under credit agreements	18,589	5,975
Repayments of long-term indebtedness	(11,857)	(2,793)
Net cash provided by (used in) financing activities	263,747	(154,268)
Net change in cash and cash equivalents	433	(132,721)
Cash and cash equivalents at beginning of period	12,289	213,117
Cash and cash equivalents at end of period	12,722	80,396
Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	224,350	189,950
Cash flows from investing activities:
Acquisitions of facilities and other related equipment	(7,684)	(41,572)
Purchases of property and equipment	(134,394)	(161,958)
Proceeds from disposition of ancillary operations		18,464
Proceeds from sale of property and equipment	1,977	7,153
Increase in other investments	(45,977)	(17,091)
Net cash used in investing activities	(186,078)	(195,004)
Cash flows from financing activities:
Proceeds from noncontrolling investors in joint ventures	637	863
Redemption of noncontrolling investments in joint ventures	(35,888)	(3,303)
Distributions to noncontrolling investors in joint ventures	(34,590)	(30,078)
Changes in intercompany balances with affiliates, net	(270,694)	69,520
Proceeds from receivables facility	300,000
Repayments of long-term indebtedness	(12,926)	(6,964)
Net cash provided by (used in) financing activities	(53,461)	30,038
Net change in cash and cash equivalents	(15,189)	24,984
Cash and cash equivalents at beginning of period	117,576	86,052
Cash and cash equivalents at end of period	102,387	111,036
Consolidation, Eliminations [Member]
Cash flows from financing activities:
Borrowings under credit agreements		(5,975)
Repayments of long-term indebtedness		$ 5,975