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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Income Statement [Abstract]        
Revenues $ 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  
Environmental remediation charge 950 0 400  
Development project charge 0 0 1,394  
Severance and reorganization costs 0 0 586 3,709
Expense from divestiture, acquisition and financing costs 0 0 144 1,410
Gain on settlement of acquisition related contingent consideration 0 0 (1,058)  
Total operating expenses 346,264 514,634 485,717 442,914
Operating income 22,110 31,866 11,916 12,421
Other expense (income):        
Interest income (247) (330) (312) (141)
Interest expense 25,639 40,420 38,175 41,570
Loss on debt extinguishment 0 999   15,584
Loss on derivative instruments 225 227 280 4,512
Impairment of investments 2,320 2,099    
Loss from equity method investments 0 0 936 4,441
Gain 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
Loss from continuing operations before income taxes and discontinued operations (5,107) (10,430) (25,511) (52,509)
Provision (benefit) for income taxes 703 1,351 1,799 (2,526)
Loss from continuing operations before discontinued operations (5,810) (11,781) (27,310) (49,983)
Discontinued operations:        
Income (loss) from discontinued operations (net of income tax benefit of $0, $0, $0 and $0, respectively) 0 0 284 (4,480)
Loss on disposal of discontinued operations (net of income tax provision of $0,$0, $0 and $0, respectively) 0 0 (378) 0
Net income (loss) (5,810) (11,781) (27,404) (54,463)
Less: Net income (loss) attributable to noncontrolling interests 208 1,188 (4,309) (321)
Net loss (6,018) (12,969) (23,095) (54,142)
Net loss attributable to common stockholders:        
Continuing operations, net of tax (6,018) (12,969) (23,001) (49,662)
Discontinued operations, net of tax 0 0 (94) (4,480)
Net loss $ (6,018) $ (12,969) $ (23,095) $ (54,142)
Weighted average common shares outstanding:        
Basic and diluted 40,262 40,642 39,820 34,015
Basic and diluted earnings per share:        
Continuing operations, net of tax $ (0.15) $ (0.32) $ (0.58) $ (1.46)
Discontinued operations, net of tax 0.00 0.00   (0.13)
Net loss per common share $ (0.15) $ (0.32) $ (0.58) $ (1.59)