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Summary of Significant Accounting Policies - Additional Information (Detail)
12 Months Ended
Dec. 31, 2015
USD ($)
Segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Accounting Policies [Abstract]      
Advertising Costs $ 44,015,000 $ 42,335,000 $ 38,845,000
Goodwill [Line Items]      
Number of reportable segments | Segment 3    
Valuation allowance $ 26,329,000 $ 29,561,000  
Provision for workers' compensation claims threshold $ 500,000.0    
Minimum      
Goodwill [Line Items]      
Amortized life assigned to identifiable intangible assets (in years) 2 years    
Maximum      
Goodwill [Line Items]      
Amortized life assigned to identifiable intangible assets (in years) 5 years