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Subsidiary Guarantors - Schedule of Consolidating Statement of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Condensed Financial Statements, Captions [Line Items]        
Revenues $ 146,185 $ 141,924 $ 406,476 $ 392,400
Operating expenses:        
Cost of operations 99,656 98,228 286,225 281,850
General and administration 17,448 17,211 52,324 49,192
Depreciation and amortization 16,385 15,787 46,374 46,562
Divestiture transactions     (5,611) 7,455
Development project charge       1,394
Severance and reorganization costs       430
Environmental remediation charge   75   75
Expense from divestiture, acquisition and financing costs       24
Gain on settlement of acquisition related contingent consideration       (1,058)
Total operating expenses 133,489 131,301 379,312 385,924
Operating income (loss) 12,696 10,623 27,164 6,476
Other expense (income), net:        
Interest income (56) (84) (267) (279)
Interest expense 10,087 9,524 30,363 28,718
Loss on debt extinguishment 345   866  
Loss (gain) on derivative instruments 41 (82) 239 366
(Income) loss from equity method investments       (90)
Loss on sale of equity method investment       221
Other income (178) (204) (387) (772)
Other expense (income), net 10,239 9,154 30,814 28,164
Income (loss) before income taxes 2,457 1,469 (3,650) (21,688)
Provision (benefit) for income taxes 198 229 1,112 1,060
Net income (loss) 2,259 1,240 (4,762) (22,748)
Less: Net income (loss) attributable to noncontrolling interests (37) 160 1,189 (3,750)
Net income (loss) attributable to common stockholders 2,296 1,080 (5,951) (18,998)
Parent [Member]        
Operating expenses:        
Cost of operations 6 11 (43) (11)
General and administration 2,054 1,226 1,858 2,366
Depreciation and amortization 267 187 767 675
Total operating expenses 2,327 1,424 2,582 3,030
Operating income (loss) (2,327) (1,424) (2,582) (3,030)
Other expense (income), net:        
Interest income     (47) (2)
Interest expense 10,053 9,621 30,137 28,769
Loss on debt extinguishment 345   866  
Loss (gain) on derivative instruments 41 (82) 239 366
(Income) loss from consolidated entities (15,247) (12,245) (28,942) (13,925)
Other income (13) (27) 4 (300)
Other expense (income), net (4,821) (2,733) 2,257 14,908
Income (loss) before income taxes 2,494 1,309 (4,839) (17,938)
Provision (benefit) for income taxes 198 229 1,112 1,060
Net income (loss) 2,296 1,080 (5,951) (18,998)
Net income (loss) attributable to common stockholders 2,296 1,080 (5,951) (18,998)
Guarantors [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues 146,185 141,591 406,352 391,386
Operating expenses:        
Cost of operations 99,582 98,199 285,816 280,918
General and administration 15,385 15,996 50,452 46,814
Depreciation and amortization 16,118 15,600 45,607 45,631
Divestiture transactions     (2,761)  
Development project charge       1,394
Severance and reorganization costs       430
Environmental remediation charge   75   75
Expense from divestiture, acquisition and financing costs       24
Gain on settlement of acquisition related contingent consideration       (1,058)
Total operating expenses 131,085 129,870 379,114 374,228
Operating income (loss) 15,100 11,721 27,238 17,158
Other expense (income), net:        
Interest income (56) (84) (220) (277)
Interest expense 34 (97) 142 (51)
(Income) loss from equity method investments       (90)
Other income (165) (177) (391) (472)
Other expense (income), net (187) (358) (469) (890)
Income (loss) before income taxes 15,287 12,079 27,707 18,048
Net income (loss) 15,287 12,079 27,707 18,048
Net income (loss) attributable to common stockholders 15,287 12,079 27,707 18,048
Non-Guarantors [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues   333 124 1,014
Operating expenses:        
Cost of operations 68 18 452 943
General and administration 9 (11) 14 12
Depreciation and amortization       256
Divestiture transactions     (2,850) 7,455
Total operating expenses 77 7 (2,384) 8,666
Operating income (loss) (77) 326 2,508 (7,652)
Other expense (income), net:        
Interest expense     84  
Loss on sale of equity method investment       221
Other expense (income), net     84 221
Income (loss) before income taxes (77) 326 2,424 (7,873)
Net income (loss) (77) 326 2,424 (7,873)
Less: Net income (loss) attributable to noncontrolling interests (37) 160 1,189 (3,750)
Net income (loss) attributable to common stockholders (40) 166 1,235 (4,123)
Elimination [Member]        
Other expense (income), net:        
(Income) loss from consolidated entities 15,247 12,245 28,942 13,925
Other expense (income), net 15,247 12,245 28,942 13,925
Income (loss) before income taxes (15,247) (12,245) (28,942) (13,925)
Net income (loss) (15,247) (12,245) (28,942) (13,925)
Net income (loss) attributable to common stockholders $ (15,247) $ (12,245) $ (28,942) $ (13,925)