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Schedule of Intangible Assets, Including Impact of Impairment Charges (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]          
Intangible Assets, Amortization Expense     $ 4,800 $ 12,911 $ 5,700
Intangible Assets, Impairment $ 6,600 $ 28,400   34,999  
Intangible Assets, Accumulated Amortization (61,258)   (66,065) (61,258)  
Goodwill, Cost 133,885   198,370 133,885  
Goodwill, Net 133,885   198,370 133,885  
Total Goodwill and Intangible Assets, Cost 227,085   301,570 227,085  
Total Goodwill and Intangible Assets, Impairment       34,999  
Total Goodwill and Intangible Assets, Net 165,827   235,505 165,827  
Customer Contracts And Relationships [Member]          
Finite Lived Intangible Assets [Line Items]          
Intangible Assets, Cost 63,260   72,260 63,260  
Intangible Assets, Amortization Expense       11,634  
Intangible Assets, Impairment       34,999  
Intangible Assets, Accumulated Amortization (52,627)   (56,303) (52,627)  
Intangible Assets, Net 10,633   $ 15,957 $ 10,633  
Intangible Assets, Useful Life     15 years 15 years  
Sales Contracts [Member]          
Finite Lived Intangible Assets [Line Items]          
Intangible Assets, Cost 2,500   $ 2,500 $ 2,500  
Intangible Assets, Amortization Expense       625  
Intangible Assets, Accumulated Amortization (2,083)   $ (2,500) (2,083)  
Intangible Assets, Net 417     $ 417  
Intangible Assets, Useful Life     4 years 4 years  
Permits [Member]          
Finite Lived Intangible Assets [Line Items]          
Intangible Assets, Cost 27,440   $ 28,440 $ 27,440  
Intangible Assets, Amortization Expense       652  
Intangible Assets, Accumulated Amortization (6,548)   (7,262) (6,548)  
Intangible Assets, Net $ 20,892   $ 21,178 $ 20,892  
Intangible Assets, Useful Life     40 years 40 years