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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ (7,094,656)	$ (6,387,612)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	400
Accounts Receivable, after allowance for credit Loss	$ 400

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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