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Supplemental Guarantor Financial Information (Details 4) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net cash provided by (used in) continuing operations $ 387,871 $ 111,717 $ 375,277
Net cash provided by (used in) discontinued operations 2,054 8,726 (8,964)
Net cash provided by (used in) operating activities 389,925 120,443 366,313
Cash flows from investing activities:      
Capital expenditures (428,731) (272,185) (231,607)
Proceeds from sale of property, plant and equipment 36,000 43,042 21,728
Cash paid for business acquisition   (3,000)  
(Increase) decrease in restricted cash (162) 820 12,930
Return of investments in non-consolidated affiliates 51,707    
Cash invested in non-consolidated affiliates (224) (471) (609)
Net cash provided by (used in) continuing operations (341,410) (231,794) (197,558)
Net cash provided by (used in) discontinued operations 135,959 (7,390) 94,593
Net cash used in investing activities (205,451) (239,184) (102,965)
Cash flows from financing activities:      
Proceeds from borrowings of long-term debt 1,878,000 1,893,740 2,098,244
Repayments of long-term debt (2,106,639) (2,036,171) (2,478,397)
Payments for debt issuance costs (1,011) (8,823) (12,034)
Net proceeds from the sale of Partnership units 114,530 289,908 109,365
Proceeds from stock options exercised 562 526 840
Proceeds from stock issued pursuant to our employee stock purchase plan 1,635 1,887 2,224
Purchases of treasury stock (2,422) (2,941) (2,061)
Stock-based compensation excess tax benefit 1,139 1,034 1,182
Distributions to noncontrolling partners in the Partnership (57,084) (39,870) (18,030)
Net cash provided by (used in) financing activities (171,290) 99,290 (298,667)
Effect of exchange rate changes on cash and cash equivalents (486) (3,007) (1,872)
Net increase (decrease) in cash and cash equivalents 12,698 (22,458) (37,191)
Cash and cash equivalents at beginning of period 21,903 44,361 81,552
Cash and cash equivalents at end of period 34,601 21,903 44,361
Parent
      
Cash flows from operating activities:      
Net cash provided by (used in) continuing operations (6,877) (1,191) (7,515)
Net cash provided by (used in) operating activities (6,877) (1,191) (7,515)
Cash flows from investing activities:      
Return on investment in consolidated subsidiaries   87,419 109,556
Net cash provided by (used in) continuing operations   87,419 109,556
Net cash used in investing activities   87,419 109,556
Cash flows from financing activities:      
Proceeds from borrowings of long-term debt 1,164,000 1,336,240 1,627,244
Repayments of long-term debt (1,422,150) (1,409,644) (1,459,836)
Payments for debt issuance costs   (7,666) (7,782)
Proceeds from stock options exercised 562 526 840
Proceeds from stock issued pursuant to our employee stock purchase plan 1,635 1,887 2,224
Purchases of treasury stock (2,422) (2,941) (2,061)
Stock-based compensation excess tax benefit 1,139 1,034 1,182
Borrowings (repayments) between consolidated subsidiaries, net 264,044 (5,731) (263,741)
Net cash provided by (used in) financing activities 6,808 (86,295) (101,930)
Net increase (decrease) in cash and cash equivalents (69) (67) 111
Cash and cash equivalents at beginning of period 93 160 49
Cash and cash equivalents at end of period 24 93 160
Guarantor Subsidiaries
      
Cash flows from operating activities:      
Net cash provided by (used in) continuing operations 127,305 62,519 66,224
Net cash provided by (used in) operating activities 127,305 62,519 66,224
Cash flows from investing activities:      
Capital expenditures (205,356) (171,470) (95,309)
Contract operations acquisition 77,415 62,217  
Proceeds from sale of property, plant and equipment 14,511 13,423 13,970
Cash paid for business acquisition   (3,000)  
Capital distributions received from consolidated subsidiaries 30,782 30,766 32,460
Investment in consolidated subsidiaries (27,184) (33,713) (24,720)
Net cash provided by (used in) continuing operations (109,832) (101,777) (73,599)
Net cash used in investing activities (109,832) (101,777) (73,599)
Cash flows from financing activities:      
Net proceeds from the sale of Partnership units   162,236 109,365
Capital distributions to affiliates   (87,419) (109,556)
Borrowings (repayments) between consolidated subsidiaries, net (9,822) (34,285) 4,148
Net cash provided by (used in) financing activities (9,822) 40,532 3,957
Net increase (decrease) in cash and cash equivalents 7,651 1,274 (3,418)
Cash and cash equivalents at beginning of period 2,810 1,536 4,954
Cash and cash equivalents at end of period 10,461 2,810 1,536
Other Subsidiaries
      
Cash flows from operating activities:      
Net cash provided by (used in) continuing operations 267,443 50,389 316,568
Net cash provided by (used in) discontinued operations 2,054 8,726 (8,964)
Net cash provided by (used in) operating activities 269,497 59,115 307,604
Cash flows from investing activities:      
Capital expenditures (223,375) (100,715) (136,298)
Contract operations acquisition (77,415) (62,217)  
Proceeds from sale of property, plant and equipment 21,489 29,619 7,758
(Increase) decrease in restricted cash (162) 820 12,930
Return of investments in non-consolidated affiliates 51,707    
Cash invested in non-consolidated affiliates (224) (471) (609)
Return on investment in consolidated subsidiaries   87,419 109,556
Net cash provided by (used in) continuing operations (227,980) (45,545) (6,663)
Net cash provided by (used in) discontinued operations 135,959 (7,390) 94,593
Net cash used in investing activities (92,021) (52,935) 87,930
Cash flows from financing activities:      
Proceeds from borrowings of long-term debt 714,000 557,500 471,000
Repayments of long-term debt (684,489) (626,527) (1,018,561)
Payments for debt issuance costs (1,011) (1,157) (4,252)
Net proceeds from the sale of Partnership units 114,530 127,672  
Distributions to noncontrolling partners in the Partnership (87,866) (70,636) (50,490)
Net proceeds from sale of general partner units 2,426 1,316  
Capital distributions to affiliates   (87,419) (109,556)
Capital contributions received from parent 24,758 32,397 24,720
Borrowings (repayments) between consolidated subsidiaries, net (254,222) 40,016 259,593
Net cash provided by (used in) financing activities (171,874) (26,838) (427,546)
Effect of exchange rate changes on cash and cash equivalents (486) (3,007) (1,872)
Net increase (decrease) in cash and cash equivalents 5,116 (23,665) (33,884)
Cash and cash equivalents at beginning of period 19,000 42,665 76,549
Cash and cash equivalents at end of period 24,116 19,000 42,665
Eliminations
      
Cash flows from investing activities:      
Capital distributions received from consolidated subsidiaries (30,782) (30,766) (32,460)
Investment in consolidated subsidiaries 27,184 33,713 24,720
Return on investment in consolidated subsidiaries   (174,838) (219,112)
Net cash provided by (used in) continuing operations (3,598) (171,891) (226,852)
Net cash used in investing activities (3,598) (171,891) (226,852)
Cash flows from financing activities:      
Distributions to noncontrolling partners in the Partnership 30,782 30,766 32,460
Net proceeds from sale of general partner units (2,426) (1,316)  
Capital distributions to affiliates   174,838 219,112
Capital contributions received from parent (24,758) (32,397) (24,720)
Net cash provided by (used in) financing activities $ 3,598 $ 171,891 $ 226,852