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Revenue Recognition - Summary of Impact of Adopting Topic 606 on Consolidated Statements of Operations and Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from Contract with Customers [Line Items]
Net revenue	$ 353,121	$ 348,999	$ 332,584	$ 301,728	$ 299,869	$ 295,193	$ 282,196	$ 255,669	$ 1,336,432	$ 1,132,927	$ 862,980
Cost of sales									964,841	808,901	610,532
Income before income taxes									72,186	55,820	59,610
Income tax provision									17,438	14,680	21,174
Net income	$ 16,476	$ 15,563	$ 16,315	$ 6,394	$ 10,793	$ 12,010	$ 11,973	$ 6,364	54,748	$ 41,140	$ 38,436
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customers [Line Items]
Net revenue									(751)
Cost of sales									(578)
Income before income taxes									(173)
Income tax provision									(43)
Net income									(130)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customers [Line Items]
Net revenue									1,335,681
Cost of sales									964,263
Income before income taxes									72,013
Income tax provision									17,395
Net income									$ 54,618

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