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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, 2016
Mar. 31, 2015
Mar. 31, 2014
Finite Lived Intangible Assets [Line Items]          
Intangible Assets, Amortization Expense     $ 12,911 $ 5,700 $ 1,700
Intangible Assets, Impairment $ 6,600 $ 28,400 34,999    
Intangible Assets, Accumulated Amortization (61,258)   (61,258) (13,348)  
Goodwill, Cost 133,885   133,885 132,515  
Goodwill, Net 133,885   133,885 132,515  
Total Goodwill and Intangible Assets, Cost 227,085   227,085 224,515  
Total Goodwill and Intangible Assets, Impairment     34,999    
Total Goodwill and Intangible Assets, Net 165,827   165,827 211,167  
Customer Contracts And Relationships [Member]          
Finite Lived Intangible Assets [Line Items]          
Intangible Assets, Cost 63,260   63,260 62,060  
Intangible Assets, Amortization Expense     11,634    
Intangible Assets, Impairment     34,999    
Intangible Assets, Accumulated Amortization (52,627)   (52,627) (5,994)  
Intangible Assets, Net 10,633   $ 10,633 $ 56,066  
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)   (2,083) (1,458)  
Intangible Assets, Net 417   $ 417 $ 1,042  
Intangible Assets, Useful Life     4 years 4 years  
Permits [Member]          
Finite Lived Intangible Assets [Line Items]          
Intangible Assets, Cost 27,440   $ 27,440 $ 27,440  
Intangible Assets, Amortization Expense     652    
Intangible Assets, Accumulated Amortization (6,548)   (6,548) (5,896)  
Intangible Assets, Net $ 20,892   $ 20,892 $ 21,544  
Intangible Assets, Useful Life     40 years 40 years