Supplemental Guarantor Financial Information (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net cash provided by (used in) continuing operations	$ 348,668	$ 383,262	$ 104,109
Net cash provided by discontinued operations	7,036	6,663	16,334
Net cash provided by operating activities	355,704	389,925	120,443
Cash flows from investing activities:
Capital expenditures	(391,725)	(428,731)	(272,150)
Proceeds from sale of property, plant and equipment	101,311	35,989	43,042
Cash paid for business acquisition			(3,000)
(Increase) decrease in restricted cash	14	(162)	820
Return of investments in non-consolidated affiliates	19,000	51,707
Cash invested in non-consolidated affiliates		(224)	(471)
Net cash used in continuing operations	(271,400)	(341,421)	(231,759)
Net cash provided by discontinued operations	74,949	135,970	(7,425)
Net cash used in investing activities	(196,451)	(205,451)	(239,184)
Cash flows from financing activities:
Proceeds from borrowings of long-term debt	2,108,037	1,878,000	1,893,740
Repayments of long-term debt	(2,195,750)	(2,106,639)	(2,036,171)
Payments for debt issuance costs	(12,147)	(1,011)	(8,823)
Payments for settlement of interest rate swaps that include financing element	(2,207)
Net proceeds from the sale of Partnership units		114,530	289,908
Proceeds from stock options exercised	8,321	562	526
Proceeds from stock issued pursuant to our employee stock purchase plan	1,632	1,635	1,887
Purchases of treasury stock	(4,539)	(2,422)	(2,941)
Stock-based compensation excess tax benefit	1,910	1,139	1,034
Distributions to noncontrolling partners in the Partnership	(61,959)	(57,084)	(39,870)
Net cash provided by (used in) financing activities	(156,702)	(171,290)	99,290
Effect of exchange rate changes on cash and cash equivalents	(1,487)	(486)	(3,007)
Net increase (decrease) in cash and cash equivalents	1,064	12,698	(22,458)
Cash and cash equivalents at beginning of period	34,601	21,903	44,361
Cash and cash equivalents at end of period	35,665	34,601	21,903
Eliminations
Cash flows from investing activities:
Capital expenditures	7,338
Proceeds from sale of property, plant and equipment	(7,338)
Capital distributions received from consolidated subsidiaries	(45,237)	(30,782)	(30,766)
Investment in consolidated subsidiaries	25,180	27,184	33,713
Return on investment in consolidated subsidiaries			(174,838)
Net cash used in continuing operations	(20,057)	(3,598)	(171,891)
Net cash used in investing activities	(20,057)	(3,598)	(171,891)
Cash flows from financing activities:
Distributions to noncontrolling partners in the Partnership	45,237	30,782	30,766
Net proceeds from sale of general partner units		(2,426)	(1,316)
Capital distributions to affiliates			174,838
Capital contributions received from parent	(25,180)	(24,758)	(32,397)
Net cash provided by (used in) financing activities	20,057	3,598	171,891
Parent | Reportable Legal Entities
Cash flows from operating activities:
Net cash provided by (used in) continuing operations	(5,873)	(6,877)	(1,191)
Net cash provided by operating activities	(5,873)	(6,877)	(1,191)
Cash flows from investing activities:
Return on investment in consolidated subsidiaries			87,419
Net cash used in continuing operations			87,419
Net cash used in investing activities			87,419
Cash flows from financing activities:
Proceeds from borrowings of long-term debt	1,102,500	1,164,000	1,336,240
Repayments of long-term debt	(1,267,250)	(1,422,150)	(1,409,644)
Payments for debt issuance costs			(7,666)
Proceeds from stock options exercised	8,321	562	526
Proceeds from stock issued pursuant to our employee stock purchase plan	1,632	1,635	1,887
Purchases of treasury stock	(4,539)	(2,422)	(2,941)
Stock-based compensation excess tax benefit	1,910	1,139	1,034
Borrowings (repayments) between consolidated subsidiaries, net	163,286	264,044	(5,731)
Net cash provided by (used in) financing activities	5,860	6,808	(86,295)
Net increase (decrease) in cash and cash equivalents	(13)	(69)	(67)
Cash and cash equivalents at beginning of period	24	93	160
Cash and cash equivalents at end of period	11	24	93
Guarantor Subsidiaries | Reportable Legal Entities
Cash flows from operating activities:
Net cash provided by (used in) continuing operations	189,563	127,305	62,519
Net cash provided by operating activities	189,563	127,305	62,519
Cash flows from investing activities:
Capital expenditures	(167,632)	(205,356)	(171,470)
Contract operations acquisition		77,415	62,217
Proceeds from sale of property, plant and equipment	28,274	14,511	13,423
Cash paid for business acquisition			(3,000)
Capital distributions received from consolidated subsidiaries	45,237	30,782	30,766
Investment in consolidated subsidiaries	(25,180)	(27,184)	(33,713)
Net cash used in continuing operations	(119,301)	(109,832)	(101,777)
Net cash used in investing activities	(119,301)	(109,832)	(101,777)
Cash flows from financing activities:
Net proceeds from the sale of Partnership units			162,236
Capital distributions to affiliates			(87,419)
Borrowings (repayments) between consolidated subsidiaries, net	(79,169)	(9,822)	(34,285)
Net cash provided by (used in) financing activities	(79,169)	(9,822)	40,532
Net increase (decrease) in cash and cash equivalents	(8,907)	7,651	1,274
Cash and cash equivalents at beginning of period	10,461	2,810	1,536
Cash and cash equivalents at end of period	1,554	10,461	2,810
Other Subsidiaries | Reportable Legal Entities
Cash flows from operating activities:
Net cash provided by (used in) continuing operations	164,978	262,834	42,781
Net cash provided by discontinued operations	7,036	6,663	16,334
Net cash provided by operating activities	172,014	269,497	59,115
Cash flows from investing activities:
Capital expenditures	(231,431)	(223,375)	(100,680)
Contract operations acquisition		(77,415)	(62,217)
Proceeds from sale of property, plant and equipment	80,375	21,478	29,619
(Increase) decrease in restricted cash	14	(162)	820
Return of investments in non-consolidated affiliates	19,000	51,707
Cash invested in non-consolidated affiliates		(224)	(471)
Return on investment in consolidated subsidiaries			87,419
Net cash used in continuing operations	(132,042)	(227,991)	(45,510)
Net cash provided by discontinued operations	74,949	135,970	(7,425)
Net cash used in investing activities	(57,093)	(92,021)	(52,935)
Cash flows from financing activities:
Proceeds from borrowings of long-term debt	1,005,537	714,000	557,500
Repayments of long-term debt	(928,500)	(684,489)	(626,527)
Payments for debt issuance costs	(12,147)	(1,011)	(1,157)
Payments for settlement of interest rate swaps that include financing element	(2,207)
Net proceeds from the sale of Partnership units		114,530	127,672
Distributions to noncontrolling partners in the Partnership	(107,196)	(87,866)	(70,636)
Net proceeds from sale of general partner units		2,426	1,316
Capital distributions to affiliates			(87,419)
Capital contributions received from parent	25,180	24,758	32,397
Borrowings (repayments) between consolidated subsidiaries, net	(84,117)	(254,222)	40,016
Net cash provided by (used in) financing activities	(103,450)	(171,874)	(26,838)
Effect of exchange rate changes on cash and cash equivalents	(1,487)	(486)	(3,007)
Net increase (decrease) in cash and cash equivalents	9,984	5,116	(23,665)
Cash and cash equivalents at beginning of period	24,116	19,000	42,665
Cash and cash equivalents at end of period	$ 34,100	$ 24,116	$ 19,000