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Revenue - Information about Receivable, Contract Assets, and Unearned Revenue from Contracts with Customers (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Revenue From Contract With Customer [Abstract]      
Accounts receivable $ 98,827 $ 90,500 $ 90,531
Contract assets 63 $ 2,800 2,812
Unearned revenue 14,092   11,963
Non-current unearned revenue $ 6,888   $ 6,012