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Supplemental Guarantor Financial Information (Details 4) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations $ 19,428 $ 37,649
Net cash provided by discontinued operations 3,314 1,011
Net cash provided by operating activities 22,742 38,660
Cash flows from investing activities:    
Capital expenditures (106,990) (115,472)
Proceeds from sale of property, plant and equipment 14,945 9,785
Increase in restricted cash   (15)
Return of investments in non-consolidated affiliates 4,665 37,563
Cash invested in non-consolidated affiliates   (224)
Net cash used in continuing operations (87,380) (68,363)
Net cash provided by (used in) discontinued operations 30,674 (1,081)
Net cash used in investing activities (56,706) (69,444)
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 1,204,037 844,500
Repayments of long-term debt (1,145,251) (913,048)
Payments for debt issuance costs (11,373) (525)
Net proceeds from the sale of Partnership units   114,568
Proceeds from stock options exercised 2,576  
Proceeds from stock issued pursuant to our employee stock purchase plan 345 405
Purchases of treasury stock (3,368) (1,757)
Stock-based compensation excess tax benefit 1,311 194
Distributions to noncontrolling partners in the Partnership (15,262) (12,207)
Net cash provided by financing activities 33,015 32,130
Effect of exchange rate changes on cash and cash equivalents (454) 243
Net increase (decrease) in cash and cash equivalents (1,403) 1,589
Cash and cash equivalents at beginning of period 34,601 21,903
Cash and cash equivalents at end of period 33,198 23,492
Parent
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations 6,851 1,894
Net cash provided by operating activities 6,851 1,894
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 405,001 279,500
Repayments of long-term debt (398,251) (438,000)
Proceeds from stock options exercised 2,576  
Proceeds from stock issued pursuant to our employee stock purchase plan 345 405
Purchases of treasury stock (3,368) (1,757)
Stock-based compensation excess tax benefit 1,311 194
Borrowings (repayments) between consolidated subsidiaries, net (14,391) 157,942
Net cash provided by financing activities (6,777) (1,716)
Net increase (decrease) in cash and cash equivalents 74 178
Cash and cash equivalents at beginning of period 24 93
Cash and cash equivalents at end of period 98 271
Guarantor Subsidiaries
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations 19,866 (13,878)
Net cash provided by operating activities 19,866 (13,878)
Cash flows from investing activities:    
Capital expenditures (68,670) (68,175)
Contract operations acquisition   77,415
Proceeds from sale of property, plant and equipment 13,522 4,094
Capital distributions received from consolidated subsidiaries 8,069 7,373
Investment in consolidated subsidiaries (5,357) (10,231)
Net cash used in continuing operations (52,436) 10,476
Net cash used in investing activities (52,436) 10,476
Cash flows from financing activities:    
Borrowings (repayments) between consolidated subsidiaries, net 22,693 1,691
Net cash provided by financing activities 22,693 1,691
Net increase (decrease) in cash and cash equivalents (9,877) (1,711)
Cash and cash equivalents at beginning of period 10,461 2,810
Cash and cash equivalents at end of period 584 1,099
Other Subsidiaries
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations (7,289) 49,633
Net cash provided by discontinued operations 3,314 1,011
Net cash provided by operating activities (3,975) 50,644
Cash flows from investing activities:    
Capital expenditures (41,698) (47,297)
Contract operations acquisition   (77,415)
Proceeds from sale of property, plant and equipment 4,801 5,691
Increase in restricted cash   (15)
Return of investments in non-consolidated affiliates 4,665 37,563
Cash invested in non-consolidated affiliates   (224)
Net cash used in continuing operations (32,232) (81,697)
Net cash provided by (used in) discontinued operations 30,674 (1,081)
Net cash used in investing activities (1,558) (82,778)
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 799,036 565,000
Repayments of long-term debt (747,000) (475,048)
Payments for debt issuance costs (11,373) (525)
Net proceeds from the sale of Partnership units   114,568
Distributions to noncontrolling partners in the Partnership (23,331) (19,580)
Net proceeds from sale of general partner units   2,426
Capital contributions received from parent 5,357 7,805
Borrowings (repayments) between consolidated subsidiaries, net (8,302) (159,633)
Net cash provided by financing activities 14,387 35,013
Effect of exchange rate changes on cash and cash equivalents (454) 243
Net increase (decrease) in cash and cash equivalents 8,400 3,122
Cash and cash equivalents at beginning of period 24,116 19,000
Cash and cash equivalents at end of period 32,516 22,122
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 (8,069) (7,373)
Investment in consolidated subsidiaries 5,357 10,231
Net cash used in continuing operations (2,712) 2,858
Net cash used in investing activities (2,712) 2,858
Cash flows from financing activities:    
Distributions to noncontrolling partners in the Partnership 8,069 7,373
Net proceeds from sale of general partner units   (2,426)
Capital contributions received from parent (5,357) (7,805)
Net cash provided by financing activities $ 2,712 $ (2,858)