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Goodwill and Intangible Assets - Schedule of Weighted Average Remaining Useful Life, Gross Carrying Amount, and Accumulated Amortization of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 53,146 $ 10,007
Accumulated amortization (8,789) (8,465)
Amortizable intangibles, net $ 44,357 $ 1,542
Weighted average amortization period, in years 9 years 9 months 18 days 5 years 4 months 24 days
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 40,025 $ 5,739
Accumulated amortization (5,789) (5,610)
Amortizable intangibles, net $ 34,236 $ 129
Weighted average amortization period, in years 9 years 10 months 25 days 4 years 3 months 19 days
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 13,121 $ 4,268
Accumulated amortization (3,000) (2,855)
Amortizable intangibles, net $ 10,121 $ 1,413
Weighted average amortization period, in years 9 years 3 months 19 days 5 years 6 months