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Revenue - Information about Receivables, Contract Assets, and Unearned Revenue from Contracts with Customers (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Revenue From Contract With Customer [Abstract]    
Accounts receivable, net $ 90,647 $ 99,385
Contract assets 2,434 3,766
Unearned revenue 14,022 17,940
Non-current unearned revenue $ 4,581 $ 5,296