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Accounts and Taxes Payable and Accrued Liabilities - Accrued Liabilities (Detail) - USD ($)
Dec. 31, 2019
Mar. 31, 2019
Payables And Accruals [Abstract]    
Payroll, payroll taxes and employee benefits $ 26,315,000 $ 23,647,000
Customer deposits 45,952,000 45,268,000
Accrued professional service fees 5,986,000 8,377,000
Self-insurance accruals 3,428,000 3,523,000
Deferred revenue 16,833,000 16,900,000
Operating lease liabilities 13,259,000 5,708,000
Other 3,293,000 2,018,000
Total accrued liabilities $ 115,066,000 $ 105,441,000