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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2020 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2017
Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Accounts receivable, allowance for credit loss | $ 5,579 | $ 11,143 | $ 15,345 |  |  |  |
Operating lease, right-of-use asset | 432,723 | 390,035 |  |  |  |  |
Operating lease, liability | 438,189 |  |  |  |  |  |
Cumulative adjustment for adoption of new accounting pronouncement | 2,663,227 | 2,197,219 | 1,987,720 |  |  |  | $ 1,994,373
Deferred contract costs | 327,448 | 131,783 |  |  |  |  |
Contract liabilities | 379,722 | 154,183 |  |  |  |  |
Net foreign currency gains (losses) | (25,398) | (9,251) | (1,853) |  |  |  |
Retained earnings |  |  |  |  |  |  |
Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Cumulative adjustment for adoption of new accounting pronouncement | $ 2,600,201 | 2,321,316 | $ 2,088,707 |  |  |  | 2,063,512
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Cumulative adjustment for adoption of new accounting pronouncement |  | 6,074 |  |  |  |  | (22,462)
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings |  |  |  |  |  |  |
Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Cumulative adjustment for adoption of new accounting pronouncement |  | $ 6,074 |  |  |  |  | $ (22,357)
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Accounts receivable, allowance for credit loss |  |  |  | $ (8,000) |  |  |
Cumulative adjustment for adoption of new accounting pronouncement |  |  |  | $ 6,000 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |
Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  | $ 343,000 |  |
Operating lease, liability |  |  |  |  | $ 340,000 |  |
Accounting Standards Update 2014-09 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Deferred contract costs |  |  |  |  |  | $ 135,000 |
Contract liabilities |  |  |  |  |  | 165,000 |
Accounting Standards Update 2014-09 | Cumulative Effect, Period of Adoption, Adjustment | Retained earnings |  |  |  |  |  |  |
Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Cumulative adjustment for adoption of new accounting pronouncement |  |  |  |  |  | $ 22,000 |

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