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Recent Accounting Standards - Additional Information (Detail) - USD ($) | Jan. 01, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2018
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Retained earnings |  | $ 575,965,000 | $ 583,489,000 |
Short-term investments |  | 0 | 108,919,000 |
Right-of-use assets |  | 73,597,000 | $ 85,538,000 |
Operating lease liabilities, Total |  | $ 95,141,000 |  |
Minimum | US Treasury Securities |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Available-for-sale securities maturity range |  | 3 months |  |
Maximum | US Treasury Securities |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Available-for-sale securities maturity range |  | 1 year |  |
ASU 2016-13 | Revision of Prior Period, Change in Accounting Principle, Adjustment |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Retained earnings |  | $ 0 |  |
ASU 2018-15 |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Material capitalized implementation costs |  | $ 0 |  |
ASU 2016-02 |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Retained earnings | $ 0 |  |  |
Right-of-use assets | 88,800,000 |  |  |
Operating lease liabilities, Total | 116,900,000 |  |  |
Reductions in deferred rent | 28,500,000 |  |  |
Reductions in prepaid expenses | $ 400,000 |  |  |
ASU 2016-16 | Revision of Prior Period, Change in Accounting Principle, Adjustment |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Retained earnings |  |  |  | $ 0

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