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Credit Losses - Summary of Allowance for Credit Losses Related to Accounts Receivable and Changes (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Allowance For Doubtful Accounts Receivable Rollforward          
Beginning Balance $ 12,122 $ 7,571 $ 6,516 $ 6,516  
Provision for expected credit losses   4,551 1,055 5,606 $ 3,594
Write-offs (1,126)        
Ending Balance $ 10,996 $ 12,122 $ 7,571 $ 10,996