Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Accounting Policies [Abstract]
Advertising Costs	$ 47,312,000	$ 44,015,000	$ 42,335,000
Goodwill [Line Items]
Number of reportable segments | segment	3
Valuation allowance	$ 18,907,000	$ 26,329,000
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