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Accrued Payroll Costs - Components of Accrued Payroll Costs (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accrued Payroll Costs [Abstract]    
Payroll and benefits $ 37,409 $ 39,043
Payroll taxes 2,640 2,832
Health insurance liabilities 2,790 2,968
Workers’ compensation liabilities 1,298 1,282
Total $ 44,137 $ 46,125