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Revenue - Information about Receivables, Contract Assets, and Unearned Revenue from Contracts with Customers (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue From Contract With Customer [Abstract]      
Accounts receivable $ 76,135 $ 144,150 $ 144,150
Contract assets 1,672 374  
Unearned revenue 14,307 13,070  
Non-current unearned revenue $ 3,639 $ 4,556