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Summary of Significant Accounting Policies - Schedule of Deferred Revenue and Customer Advances by Arrangement (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances		$ 14,246	$ 26,194
Long-term deferred revenue	$ 3,126	3,228
Deferred revenue and customer advances recognized in income		83,497
Deferred Revenue [Member]
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances	12,842	14,246
Customer Advances [Member]
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances	13,352	6,112
ASC 606 [Member]
Change in Contract with Customer, Liability [Line Items]
Adjustment in deferred revenue and customer advances	$ (1,520)
Deferred revenue and customer advances recognized in income		$ 61,012

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