Revenue Recognition - Schedule of Changes in Contract Balances Due to Adoption of New Accounting Standards (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Revenue From Contract With Customer Balances Of Net Contract Assets Liabilities [Line Items]
Contract assets	$ 126,688	$ 123,197
Contract liabilities	(33,494)	(38,571)
Net contract assets (liabilities)	93,194
ASU 2014-09 | As Reported
Revenue From Contract With Customer Balances Of Net Contract Assets Liabilities [Line Items]
Contract assets	126,688	123,197
Contract liabilities	(33,494)	(38,571)
Net contract assets (liabilities)		$ 84,626
ASU 2014-09 | Change
Revenue From Contract With Customer Balances Of Net Contract Assets Liabilities [Line Items]
Contract assets	3,491
Contract liabilities	5,077
Net contract assets (liabilities)	$ 8,568