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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