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Supplemental Financial Statement Information - Summary of Rollforward of Insurance Reserve (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Balance Sheet Components Disclosure [Abstract] |  |
Beginning balance | $ 810,273 | $ 376,538
Losses paid | (99,551) | (48,855)
Change in estimates | 23,820 | 3,392
Reserves for current period | 202,442 | 135,193
Ending balance | $ 936,984 | $ 466,268

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- Definition Balance sheet components disclosure. + References No definition available. + Details
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- Definition Increase decrease in insurance change in estimates. + References No definition available. + Details
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- Definition Insurance reserves current. + References No definition available. + Details
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- Definition Insurance reserves during period. + References No definition available. + Details
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- Definition Insurance reserves losses paid. + References No definition available. + Details
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