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Fair Value of Financial Instruments - Summary of Redeemable Common Stock Associated with ESOP (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Redeemable common stock | $ 2,577,011 | $ 1,876,309
Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Redeemable common stock | 2,577,011 | 0
Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Redeemable common stock | 0 | 0
Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Redeemable common stock | $ 0 | $ 1,876,309

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