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Segment Information - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Segment | Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | Segment |  |  | 4 |
Total revenues | $ 575,219 | $ 473,187 | $ 1,194,499 | $ 974,648
Document Period End Date |  |  | Jun. 30, 2019 |
London, Bermuda and Cayman Islands |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 4,600 | $ 4,200 | $ 8,000 | $ 7,500

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