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Schedule of Intangible Assets, Including Impact of Impairment Charge (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Mar. 31, 2015
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Amortization   $ 8,314 $ 5,700
Intangible Assets, Impairment $ 28,354 28,354  
Intangible Assets, Accumulated Amortization (50,016) (50,016) (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   28,354  
Total Goodwill and Intangible Assets, Net 177,069 177,069 211,167
Customer Contracts And Relationships [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Cost 63,260 63,260 62,060
Intangible Assets, Amortization   7,656  
Intangible Assets, Impairment   28,354  
Intangible Assets, Accumulated Amortization (42,004) (42,004) (5,994)
Intangible Assets, Net 21,256 21,256 $ 56,066
Customer Contracts And Relationships [Member] | Minimum [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Useful Life     5 years
Customer Contracts And Relationships [Member] | Maximum [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Useful Life     15 years
Sales Contracts [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Cost 2,500 2,500 $ 2,500
Intangible Assets, Amortization   312  
Intangible Assets, Accumulated Amortization (1,770) (1,770) (1,458)
Intangible Assets, Net 730 730 $ 1,042
Intangible Assets, Useful Life     4 years
Permits [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Cost 27,440 27,440 $ 27,440
Intangible Assets, Amortization   346  
Intangible Assets, Accumulated Amortization (6,242) (6,242) (5,896)
Intangible Assets, Net $ 21,198 $ 21,198 $ 21,544
Intangible Assets, Useful Life     40 years