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Revenue Recognition - Summary of Contract Assets Offset with Deferred Revenue Balances (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Revenue Recognition [Abstract]            
Gross deferred revenue $ 45,801 $ 36,081 $ 51,694 $ 37,260 $ 45,582 $ 39,544
Gross contract assets (17,137)   (19,343)      
Deferred revenue, net $ 28,664   $ 32,351