Fair Value Measurements - Fair Value and Carrying Value of Debt Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Carrying Amount | New Term Loan
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Senior Term Loan, net	$ 556,224
Carrying Amount | Senior Term Loan
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Senior Term Loan, net		$ 449,165
Fair Value | New Term Loan
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Senior Term Loan, net	$ 563,176
Fair Value | Senior Term Loan
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Senior Term Loan, net		$ 441,742