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Supplemental Guarantor Financial Information (Details 4) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net cash provided by continuing operations $ 223,287 $ 141,991
Net cash provided by discontinued operations 4,951 2,392
Net cash provided by operating activities 228,238 144,383
Cash flows from investing activities:    
Capital expenditures (307,863) (328,725)
Proceeds from sale of property, plant and equipment 84,098 27,996
Increase in restricted cash   (163)
Return of investments in non-consolidated affiliates 14,165 47,084
Cash invested in non-consolidated affiliates   (224)
Net cash used in continuing operations (209,600) (254,032)
Net cash provided by discontinued operations 58,329 121,041
Net cash used in investing activities (151,271) (132,991)
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 1,778,037 1,548,000
Repayments of long-term debt (1,796,250) (1,630,621)
Payments for debt issuance costs (11,929) (549)
Payments for settlement of interest rate swaps that include financing element (1,271)  
Net proceeds from the sale of Partnership units   114,530
Proceeds from stock options exercised 5,975 119
Proceeds from stock issued pursuant to our employee stock purchase plan 1,213 1,280
Purchases of treasury stock (3,594) (1,892)
Stock-based compensation excess tax benefit 1,075 210
Distributions to noncontrolling partners in the Partnership (46,244) (41,975)
Net cash used in financing activities (72,988) (10,898)
Effect of exchange rate changes on cash and cash equivalents (1,516) (326)
Net increase in cash and cash equivalents 2,463 168
Cash and cash equivalents at beginning of period 34,601 21,903
Cash and cash equivalents at end of period 37,064 22,071
Eliminations
    
Cash flows from investing activities:    
Capital expenditures 3,378  
Proceeds from sale of property, plant and equipment (3,378)  
Capital distributions received from consolidated subsidiaries (32,612) (22,847)
Investment in consolidated subsidiaries 16,830 23,483
Net cash used in continuing operations (15,782) 636
Net cash used in investing activities (15,782) 636
Cash flows from financing activities:    
Distributions to noncontrolling partners in the Partnership 32,612 22,847
Net proceeds from sale of general partner units   (2,426)
Capital contributions received from parent (16,830) (21,057)
Net cash used in financing activities 15,782 (636)
Parent | Reportable Legal Entities
    
Cash flows from operating activities:    
Net cash provided by continuing operations 6,301 2,740
Net cash provided by operating activities 6,301 2,740
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 854,501 886,000
Repayments of long-term debt (911,750) (982,150)
Proceeds from stock options exercised 5,975 119
Proceeds from stock issued pursuant to our employee stock purchase plan 1,213 1,280
Purchases of treasury stock (3,594) (1,892)
Stock-based compensation excess tax benefit 1,075 210
Borrowings (repayments) between consolidated subsidiaries, net 46,272 93,705
Net cash used in financing activities (6,308) (2,728)
Net increase in cash and cash equivalents (7) 12
Cash and cash equivalents at beginning of period 24 93
Cash and cash equivalents at end of period 17 105
Guarantor Subsidiaries | Reportable Legal Entities
    
Cash flows from operating activities:    
Net cash provided by continuing operations 117,958 21,848
Net cash provided by operating activities 117,958 21,848
Cash flows from investing activities:    
Capital expenditures (143,823) (187,882)
Contract operations acquisition   77,415
Proceeds from sale of property, plant and equipment 21,475 8,986
Capital distributions received from consolidated subsidiaries 32,612 22,847
Investment in consolidated subsidiaries (16,830) (23,483)
Net cash used in continuing operations (106,566) (102,117)
Net cash used in investing activities (106,566) (102,117)
Cash flows from financing activities:    
Borrowings (repayments) between consolidated subsidiaries, net (17,339) 78,120
Net cash used in financing activities (17,339) 78,120
Net increase in cash and cash equivalents (5,947) (2,149)
Cash and cash equivalents at beginning of period 10,461 2,810
Cash and cash equivalents at end of period 4,514 661
Other Subsidiaries | Reportable Legal Entities
    
Cash flows from operating activities:    
Net cash provided by continuing operations 99,028 117,403
Net cash provided by discontinued operations 4,951 2,392
Net cash provided by operating activities 103,979 119,795
Cash flows from investing activities:    
Capital expenditures (167,418) (140,843)
Contract operations acquisition   (77,415)
Proceeds from sale of property, plant and equipment 66,001 19,010
Increase in restricted cash   (163)
Return of investments in non-consolidated affiliates 14,165 47,084
Cash invested in non-consolidated affiliates   (224)
Net cash used in continuing operations (87,252) (152,551)
Net cash provided by discontinued operations 58,329 121,041
Net cash used in investing activities (28,923) (31,510)
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 923,536 662,000
Repayments of long-term debt (884,500) (648,471)
Payments for debt issuance costs (11,929) (549)
Payments for settlement of interest rate swaps that include financing element (1,271)  
Net proceeds from the sale of Partnership units   114,530
Distributions to noncontrolling partners in the Partnership (78,856) (64,822)
Net proceeds from sale of general partner units   2,426
Capital contributions received from parent 16,830 21,057
Borrowings (repayments) between consolidated subsidiaries, net (28,933) (171,825)
Net cash used in financing activities (65,123) (85,654)
Effect of exchange rate changes on cash and cash equivalents (1,516) (326)
Net increase in cash and cash equivalents 8,417 2,305
Cash and cash equivalents at beginning of period 24,116 19,000
Cash and cash equivalents at end of period $ 32,533 $ 21,305