Intangible Assets and Goodwill - Additional Information (Detail)	3 Months Ended				12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) reporting_unit	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period for total intangibles					14 years
Amortization expense					$ 4,300,000	$ 4,800,000	$ 5,300,000
Number of reporting units | reporting_unit					1
Goodwill impairment	$ 0	$ 1,650,000	$ 35,400,000	$ 0	$ 0	$ 37,050,000	$ 0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortized period					14 years
Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortized period					3 years
Brand name
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortized period					1 year