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Summary of Fair Value Estimates of Identifiable Intangible Assets and Weighted-Average Useful Lives (Detail)
$ in Thousands
12 Months Ended
Mar. 31, 2017
USD ($)
Acquired Finite Lived Intangible Assets [Line Items]  
Estimated Fair Value $ 10,000
Customer Relationships [Member]  
Acquired Finite Lived Intangible Assets [Line Items]  
Weighted Average Life 15 years
Estimated Fair Value $ 9,000
Permits [Member]  
Acquired Finite Lived Intangible Assets [Line Items]  
Weighted Average Life 40 years
Estimated Fair Value $ 1,000