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Revenue Recognition - Summary of Receivables and Contract Liabilities from Contracts with Customers (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Contract With Customer Liability [Abstract]    
Total receivables, net $ 122,403 $ 109,605
Contract assets 3,000  
Deferred revenue $ 11,858 $ 14,574