Accounts and Taxes Payable and Accrued Liabilities - Accrued Liabilities (Detail) - USD ($)	Jun. 30, 2017	Mar. 31, 2017
Payables And Accruals [Abstract]
Payroll, payroll taxes and employee benefits	$ 15,999,000	$ 14,465,000
Customer deposits	31,730,000	32,471,000
Accrued professional service fees	4,408,000	4,551,000
Self-insurance accruals	2,896,000	2,835,000
Deferred revenue	10,904,000	10,096,000
Accrued rent	5,607,000	5,774,000
Other	3,217,000	3,276,000
Total accrued liabilities	$ 74,761,000	$ 73,468,000