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Schedule of Goodwill and Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Cost $ 168,315 $ 168,315
Accumulated Amortization (7,625) (5,915)
Total intangible assets and goodwill, Net 160,690 162,400
Customer contracts and relationships [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Amortization Period (years) 15 years 15 years
Cost 6,060 6,060
Accumulated Amortization (1,580) (1,176)
Total intangible assets and goodwill, Net 4,480 4,884
Sales contracts [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Amortization Period (years) 4 years 4 years
Cost 2,500 2,500
Accumulated Amortization (833) (208)
Total intangible assets and goodwill, Net 1,667 2,292
Permits [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Amortization Period (years) 40 years 40 years
Cost 27,240 27,240
Accumulated Amortization (5,212) (4,531)
Total intangible assets and goodwill, Net 22,028 22,709
Goodwill [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Cost 132,515 132,515
Accumulated Amortization     
Total intangible assets and goodwill, Net $ 132,515 $ 132,515