Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill And Other Intangible Assets [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0
Discrete forecast period	5 years
Intangible assets, net	$ 3,297,000	3,642,000
Finite-lived intangible assets, net	1,100,000	1,400,000
Amortization of intangible assets	27,500,000	27,200,000
Impairment expense	0	0	$ 0
Trademarks and Trade Names
Goodwill And Other Intangible Assets [Line Items]
Intangible assets, net	$ 2,200,000	$ 2,200,000