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Revenue Recognition - Summary of Contract Balances (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Revenue From Contract With Customer [Abstract]    
Trade $ 140,220 $ 123,320
Contract assets 3,435 3,000
Other receivables 10,348 7,709
Total receivables, net 154,003 134,029
Deferred revenue $ 368 $ 20,043