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Recent Accounting Standards - Additional Information (Detail) - USD ($) | Jan. 01, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Right-of-use assets |  | $ 89,631,000 | $ 0
Operating lease liabilities, Total |  | $ 117,447,000 |
ASU 2016-02 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
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 |  |
Cumulative-effect adjustment to retained earnings | $ 0 |  |

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