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Subsidiary Guarantors - Schedule of Consolidating Statement of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]        
Revenues $ 143,714 $ 137,279 $ 260,292 $ 250,476
Operating expenses:        
Cost of operations 98,737 97,218 186,569 183,622
General and administration 18,071 15,594 34,876 31,981
Depreciation and amortization 16,241 17,167 29,990 30,775
Divestiture transactions (677) 7,455 (5,611) 7,455
Development project charge   (46)   1,394
Severance and reorganization costs   350   430
Expense from divestiture, acquisition and financing costs   14   24
Gain on settlement of acquisition related contingent consideration       (1,058)
Total operating expenses 132,372 137,752 245,824 254,623
Operating income (loss) 11,342 (473) 14,468 (4,147)
Other expense (income):        
Interest income (70) (85) (211) (195)
Interest expense 10,150 9,588 20,276 19,194
Loss on debt extinguishment     521  
Loss on derivative instruments 47 298 198 448
Income from equity method investments   (63)   (90)
Loss on sale of equity method investment       221
Other income (46) (361) (209) (568)
Other expense (income), net 10,081 9,377 20,575 19,010
Income (loss) before income taxes 1,261 (9,850) (6,107) (23,157)
Provision (benefit) for income taxes 318 528 914 831
Net income (loss) 943 (10,378) (7,021) (23,988)
Less: Net income (loss) attributable to noncontrolling interests (82) (3,723) 1,226 (3,910)
Net income (loss) attributable to common stockholders 1,025 (6,655) (8,247) (20,078)
Parent [Member]        
Operating expenses:        
Cost of operations 34 22 (49) (22)
General and administration (79) 133 (196) 1,140
Depreciation and amortization 278 223 500 488
Total operating expenses 233 378 255 1,606
Operating income (loss) (233) (378) (255) (1,606)
Other expense (income):        
Interest income     (48) (2)
Interest expense 10,096 9,569 20,085 19,149
Loss on debt extinguishment     521  
Loss on derivative instruments 47 298 198 448
(Income) loss from consolidated entities (11,772) (3,855) (13,695) (1,681)
Other income 53 (263) 17 (273)
Other expense (income), net (1,576) 5,749 7,078 17,641
Income (loss) before income taxes 1,343 (6,127) (7,333) (19,247)
Provision (benefit) for income taxes 318 528 914 831
Net income (loss) 1,025 (6,655) (8,247) (20,078)
Net income (loss) attributable to common stockholders 1,025 (6,655) (8,247) (20,078)
Guarantors [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues 143,714 136,861 260,168 249,795
Operating expenses:        
Cost of operations 98,556 96,717 186,234 182,719
General and administration 18,130 15,441 35,067 30,818
Depreciation and amortization 15,963 16,884 29,490 30,031
Divestiture transactions (677)   (2,761)  
Development project charge   (46)   1,394
Severance and reorganization costs   350   430
Expense from divestiture, acquisition and financing costs   14   24
Gain on settlement of acquisition related contingent consideration       (1,058)
Total operating expenses 131,972 129,360 248,030 244,358
Operating income (loss) 11,742 7,501 12,138 5,437
Other expense (income):        
Interest income (70) (85) (163) (193)
Interest expense 54 19 107 45
Income from equity method investments   (63)   (90)
Other income (99) (98) (226) (295)
Other expense (income), net (115) (227) (282) (533)
Income (loss) before income taxes 11,857 7,728 12,420 5,970
Net income (loss) 11,857 7,728 12,420 5,970
Net income (loss) attributable to common stockholders 11,857 7,728 12,420 5,970
Non-Guarantors [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues   418 124 681
Operating expenses:        
Cost of operations 147 479 384 925
General and administration 20 20 5 23
Depreciation and amortization   60   256
Divestiture transactions   7,455 (2,850) 7,455
Total operating expenses 167 8,014 (2,461) 8,659
Operating income (loss) (167) (7,596) 2,585 (7,978)
Other expense (income):        
Interest expense     84  
Loss on sale of equity method investment       221
Other expense (income), net     84 221
Income (loss) before income taxes (167) (7,596) 2,501 (8,199)
Net income (loss) (167) (7,596) 2,501 (8,199)
Less: Net income (loss) attributable to noncontrolling interests (82) (3,723) 1,226 (3,910)
Net income (loss) attributable to common stockholders (85) (3,873) 1,275 (4,289)
Elimination [Member]        
Other expense (income):        
(Income) loss from consolidated entities 11,772 3,855 13,695 1,681
Other expense (income), net 11,772 3,855 13,695 1,681
Income (loss) before income taxes (11,772) (3,855) (13,695) (1,681)
Net income (loss) (11,772) (3,855) (13,695) (1,681)
Net income (loss) attributable to common stockholders $ (11,772) $ (3,855) $ (13,695) $ (1,681)