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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]      
Facility rent expense $ 3,500,000 $ 3,500,000 $ 3,500,000
Health compensation plan annual stop-loss insurance per claim 200,000    
Workers compensation plan annual stop-loss insurance per claim 350,000    
Accruals for health and workers' compensation plans $ 3,000,000 $ 2,900,000