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

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