Goodwill and Other Intangible Assets (Additional Information) (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of reportable segments | Segment		4
Gross carrying amount	$ 214,810	$ 214,810	$ 173,272
Amortization expense		14,800	$ 11,200	$ 10,900
Estimated future amortization expense for 2018	15,300	15,300
Estimated future amortization expense for 2019	15,100	15,100
Estimated future amortization expense for 2020	11,800	11,800
Estimated future amortization expense for 2021	11,100	11,100
Estimated future amortization expense for 2022	10,700	$ 10,700
Technology License Agreement
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets, finite-lived	$ 500