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Subsidiary Guarantors - Schedule of Consolidating Statement of Operations (Detail) - USD ($)
$ in Thousands
 2 Months Ended 3 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Condensed Financial Statements, Captions [Line Items]                                      
Revenues $ 85,646 $ 140,024 $ 146,185 $ 143,714 $ 116,577 $ 141,341 $ 141,387 $ 118,927 $ 117,852 $ 132,296 $ 128,558 $ 108,694 $ 112,167 $ 116,836 $ 117,638 $ 368,374 $ 546,500 $ 497,633 $ 455,335
Operating expenses:                                      
Cost of operations                               258,650 382,615 354,592 323,014
General and administration                               45,732 72,892 61,865 58,205
Depreciation and amortization                               41,485 62,704 60,339 56,576
Contract settlement charge                                 1,940    
Divestiture transactions                               (553) (5,517) 7,455  
Development project charge                               0 0 1,394  
Severance and reorganization costs                               0 0 586 3,709
Environmental remediation charge                               950 0 400  
Expense from divestiture, acquisition and financing costs                               0 0 144 1,410
Change in fair value of acquisition related contingent consideration                               0 0 (1,058)  
Total operating expenses                               346,264 514,634 485,717 442,914
Operating income (loss) 2,708 4,702 12,696 11,342 3,126 10,064 9,338 (5,973) (1,298) 9,450 9,737 2,110 78 4,426 5,807 22,110 31,866 11,916 12,421
Other expense (income), net:                                      
Interest income                               (247) (330) (312) (141)
Interest expense                               25,639 40,420 38,175 41,570
Loss on debt extinguishment                               0 999   15,584
(Gain) loss on derivative instruments                               225 227 280 4,512
(Income) loss from equity method investments                               0 0 936 4,441
Impairment of investments                               2,320 2,099    
(Gain) loss on sale of equity method investment                               0 0 (593)  
Other income                               (720) (1,119) (1,059) (1,036)
Other expense (income), net                               27,217 42,296 37,427 64,930
Income (loss) before income taxes                               (5,107) (10,430) (25,511) (52,509)
Provision (benefit) for income taxes                               703 1,351 1,799 (2,526)
Income (loss) from continuing operations (5,987) (7,019) 2,296 1,025 (9,271) 259 (290) (11,815) (10,750) (294) (142) (9,696) (11,079) (20,732) (8,155) (5,810) (11,781) (27,310) (49,983)
Discontinued operations:                                      
Income (loss) from discontinued operations, net                               0 0 284 (4,480)
Gain (loss) on disposal of discontinued operations, net                     (378)         0 0 (378) 0
Net income (loss) (6,017) (7,020) 2,259 943 (7,963) 361 (154) (15,633) (11,033) (575) (163) (13,518) (11,474) (21,092) (8,379) (5,810) (11,781) (27,404) (54,463)
Less: Net income (loss) attributable to noncontrolling interests                               208 1,188 (4,309) (321)
Net income (loss) attributable to common stockholders $ (5,987) $ (7,019) $ 2,296 $ 1,025 $ (9,271) $ 259 $ (290) $ (11,815) $ (10,750) $ (339) $ (191) $ (13,397) $ (11,407) $ (20,967) $ (8,371) (6,018) (12,969) (23,095) (54,142)
Parent [Member]                                      
Operating expenses:                                      
Cost of operations                               175 (1) (23) (295)
General and administration                               2,681 2,255 1,377 220
Depreciation and amortization                               548 1,066 935 1,017
Severance and reorganization costs                                   4 1,766
Expense from divestiture, acquisition and financing costs                                     303
Total operating expenses                               3,404 3,320 2,293 3,011
Operating income (loss)                               (3,404) (3,320) (2,293) (3,011)
Other expense (income), net:                                      
Interest income                                 (47) (4) (32,896)
Interest expense                               25,815 40,191 38,095 42,405
Loss on debt extinguishment                                 999   15,584
(Gain) loss on derivative instruments                               225 227 280 4,512
(Income) loss from equity method investments                                   (18,811) 24,723
Impairment of investments                               2,320 2,099    
(Income) loss from consolidated entities                               (26,148) (34,610)    
Other income                               (301) (561) (557) (671)
Other expense (income), net                               1,911 8,298 19,003 53,657
Income (loss) before income taxes                               (5,315) (11,618) (21,296) (56,668)
Provision (benefit) for income taxes                               703 1,351 1,799 (2,526)
Income (loss) from continuing operations                                   (23,095) (54,142)
Discontinued operations:                                      
Net income (loss)                               (6,018) (12,969) (23,095) (54,142)
Net income (loss) attributable to common stockholders                               (6,018) (12,969) (23,095) (54,142)
Guarantors [Member]                                      
Condensed Financial Statements, Captions [Line Items]                                      
Revenues                               367,576 546,376 495,391 453,589
Operating expenses:                                      
Cost of operations                               258,142 382,160 351,829 321,382
General and administration                               43,011 70,625 60,446 57,898
Depreciation and amortization                               40,942 61,643 58,651 55,142
Contract settlement charge                                 1,940    
Divestiture transactions                               (553) (2,667)    
Development project charge                                   1,394  
Severance and reorganization costs                                   582 1,943
Environmental remediation charge                               950   400  
Expense from divestiture, acquisition and financing costs                                   144 1,107
Change in fair value of acquisition related contingent consideration                                   (1,058)  
Total operating expenses                               342,492 513,701 472,388 437,472
Operating income (loss)                               25,084 32,675 23,003 16,117
Other expense (income), net:                                      
Interest income                               (247) (283) (308) (113)
Interest expense                               (176) 145 80 32,033
(Income) loss from equity method investments                                   (169) 36
Other income                               (419) (558) (501) (365)
Other expense (income), net                               (842) (696) (898) 31,591
Income (loss) before income taxes                               25,926 33,371 23,901 (15,474)
Income (loss) from continuing operations                                   23,901 (15,474)
Discontinued operations:                                      
Income (loss) from discontinued operations, net                                   284 (4,480)
Gain (loss) on disposal of discontinued operations, net                                   (378)  
Net income (loss)                               25,926 33,371 23,807 (19,954)
Net income (loss) attributable to common stockholders                               25,926 33,371 23,807 (19,954)
Non-Guarantors [Member]                                      
Condensed Financial Statements, Captions [Line Items]                                      
Revenues                               798 124 2,242 1,746
Operating expenses:                                      
Cost of operations                               333 456 2,786 1,927
General and administration                               40 12 42 87
Depreciation and amortization                               (5) (5) 753 417
Divestiture transactions                                 (2,850) 7,455  
Total operating expenses                               368 (2,387) 11,036 2,431
Operating income (loss)                               430 2,511 (8,794) (685)
Other expense (income), net:                                      
Interest expense                                 84    
(Income) loss from equity method investments                                   1,105 4,405
(Gain) loss on sale of equity method investment                                   (593)  
Other income                                   (1)  
Other expense (income), net                                 84 511 4,405
Income (loss) before income taxes                               430 2,427 (9,305) (5,090)
Income (loss) from continuing operations                                   (9,305) (5,090)
Discontinued operations:                                      
Net income (loss)                               430 2,427 (9,305) (5,090)
Less: Net income (loss) attributable to noncontrolling interests                               208 1,188 (4,309) (321)
Net income (loss) attributable to common stockholders                               222 1,239 (4,996) (4,769)
Elimination [Member]                                      
Other expense (income), net:                                      
Interest income                                     32,868
Interest expense                                     (32,868)
(Income) loss from equity method investments                                   18,811 (24,723)
(Income) loss from consolidated entities                               26,148 34,610    
Other expense (income), net                               26,148 34,610 18,811 (24,723)
Income (loss) before income taxes                               (26,148) (34,610) (18,811) 24,723
Income (loss) from continuing operations                                   (18,811) 24,723
Discontinued operations:                                      
Net income (loss)                               (26,148) (34,610) (18,811) 24,723
Net income (loss) attributable to common stockholders                               $ (26,148) $ (34,610) $ (18,811) $ 24,723