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Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Valuation And Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 2,312 $ 2,323 $ 3,191
Charged to Costs and Expenses 5,683    
Deductions [1] (1,479) (11) (868)
Ending Balance $ 6,516 $ 2,312 $ 2,323
[1] Consists of uncollectible accounts written off