Revenues - Summary of Trade Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable, net	$ 431,659	$ 428,133
Receivables, Net [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable, net, current	401,251	398,112
Deferred Charges and Other Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable, net, noncurrent	$ 30,408	$ 30,021