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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating Lease, Right-of-Use Asset | $ 374,231 |  | $ 0
Operating Lease, Liability | 375,422 |  |
Accounts receivable, allowance for doubtful accounts | $ 11,853 |  | $ 15,345
Accounting Standards Update 2016-02 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating Lease, Right-of-Use Asset |  | $ 343,000 |
Operating Lease, Liability |  | $ 340,000 |

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