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Supplemental Guarantor Financial Information (Details 4) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations $ 76,091 $ 52,604
Net cash provided by discontinued operations 4,524 1,123
Net cash provided by operating activities 80,615 53,727
Cash flows from investing activities:    
Capital expenditures (214,934) (227,854)
Proceeds from sale of property, plant and equipment 71,111 26,033
(Increase) decrease in restricted cash   (162)
Return of investments in non-consolidated affiliates 9,387 42,291
Cash invested in non-consolidated affiliates   (224)
Net cash used in continuing operations (134,436) (159,916)
Net cash provided by discontinued operations 29,335 (973)
Net cash used in investing activities (105,101) (160,889)
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 1,474,037 1,179,000
Repayments of long-term debt (1,407,750) (1,158,104)
Payments for debt issuance costs (11,929) (549)
Payments for settlement of interest rate swaps that include financing elements (314)  
Net proceeds from the sale of Partnership units   114,530
Proceeds from stock options exercised 5,789  
Proceeds from stock issued pursuant to our employee stock purchase plan 805 888
Purchases of treasury stock (3,515) (1,842)
Stock-based compensation excess tax benefit 1,026 208
Distributions to noncontrolling partners in the Partnership (30,679) (27,017)
Net cash provided by financing activities 27,470 107,114
Effect of exchange rate changes on cash and cash equivalents (644) (476)
Net increase (decrease) in cash and cash equivalents 2,340 (524)
Cash and cash equivalents at beginning of period 34,601 21,903
Cash and cash equivalents at end of period 36,941 21,379
Parent
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations (3,235) 2,324
Net cash provided by operating activities (3,235) 2,324
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 631,501 570,000
Repayments of long-term debt (599,250) (541,650)
Proceeds from stock options exercised 5,789  
Proceeds from stock issued pursuant to our employee stock purchase plan 805 888
Purchases of treasury stock (3,515) (1,842)
Stock-based compensation excess tax benefit 1,026 208
Borrowings (repayments) between consolidated subsidiaries, net (33,107) (29,744)
Net cash provided by financing activities 3,249 (2,140)
Net increase (decrease) in cash and cash equivalents 14 184
Cash and cash equivalents at beginning of period 24 93
Cash and cash equivalents at end of period 38 277
Guarantor Subsidiaries
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations 40,425 (11,787)
Net cash provided by operating activities 40,425 (11,787)
Cash flows from investing activities:    
Capital expenditures (115,664) (143,969)
Contract operations acquisition   77,415
Proceeds from sale of property, plant and equipment 16,934 7,719
Capital distributions received from consolidated subsidiaries 20,250 15,043
Investment in consolidated subsidiaries (9,454) (16,552)
Net cash used in continuing operations (87,934) (60,344)
Net cash used in investing activities (87,934) (60,344)
Cash flows from financing activities:    
Borrowings (repayments) between consolidated subsidiaries, net 39,726 69,909
Net cash provided by financing activities 39,726 69,909
Net increase (decrease) in cash and cash equivalents (7,783) (2,222)
Cash and cash equivalents at beginning of period 10,461 2,810
Cash and cash equivalents at end of period 2,678 588
Other Subsidiaries
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations 38,901 62,067
Net cash provided by discontinued operations 4,524 1,123
Net cash provided by operating activities 43,425 63,190
Cash flows from investing activities:    
Capital expenditures (102,648) (83,885)
Contract operations acquisition   (77,415)
Proceeds from sale of property, plant and equipment 57,555 18,314
(Increase) decrease in restricted cash   (162)
Return of investments in non-consolidated affiliates 9,387 42,291
Cash invested in non-consolidated affiliates   (224)
Net cash used in continuing operations (35,706) (101,081)
Net cash provided by discontinued operations 29,335 (973)
Net cash used in investing activities (6,371) (102,054)
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 842,536 609,000
Repayments of long-term debt (808,500) (616,454)
Payments for debt issuance costs (11,929) (549)
Payments for settlement of interest rate swaps that include financing elements (314)  
Net proceeds from the sale of Partnership units   114,530
Distributions to noncontrolling partners in the Partnership (50,929) (42,060)
Net proceeds from sale of general partner units   2,426
Capital contributions received from parent 9,454 14,126
Borrowings (repayments) between consolidated subsidiaries, net (6,619) (40,165)
Net cash provided by financing activities (26,301) 40,854
Effect of exchange rate changes on cash and cash equivalents (644) (476)
Net increase (decrease) in cash and cash equivalents 10,109 1,514
Cash and cash equivalents at beginning of period 24,116 19,000
Cash and cash equivalents at end of period 34,225 20,514
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 (20,250) (15,043)
Investment in consolidated subsidiaries 9,454 16,552
Net cash used in continuing operations (10,796) 1,509
Net cash used in investing activities (10,796) 1,509
Cash flows from financing activities:    
Distributions to noncontrolling partners in the Partnership 20,250 15,043
Net proceeds from sale of general partner units   (2,426)
Capital contributions received from parent (9,454) (14,126)
Net cash provided by financing activities $ 10,796 $ (1,509)