Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Additional Information (Detail)

v3.8.0.1
Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]        
Intangible amortization expense $ 59 $ 58 $ 177 $ 175
Impairment losses, intangible assets     9,100  
Impairment losses, goodwill 5,716   5,716  
Permits [Member]        
Finite Lived Intangible Assets [Line Items]        
Impairment losses, intangible assets 8,600   8,600  
Tradename [Member]        
Finite Lived Intangible Assets [Line Items]        
Impairment losses, intangible assets 500   500  
Customer Relationships [Member]        
Finite Lived Intangible Assets [Line Items]        
Intangible amortization expense 45 $ 45 135 $ 135
Future amortization expenses, remainder of 2018 45   45  
Future amortization expenses, 2019 180   180  
Future amortization expenses, 2020 180   180  
Future amortization expenses, 2021 180   180  
Future amortization expenses, 2022 $ 180   $ 180