Long-Term Debt - Additional Information (Detail) - USD ($)		1 Months Ended	6 Months Ended	9 Months Ended
	Oct. 05, 2021	Jan. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Aug. 10, 2021	Dec. 31, 2020	May 03, 2019	Sep. 29, 2017
Debt Disclosure [Line Items]
Debt Issuance Costs, Line of Credit Arrangements, Gross				$ 700,000	$ 100,000
Letters of credit outstanding				$ 400,000			$ 400,000
Current Ratio				1.00
Debt To E B I T D Ratio Maximum				3.50
Second Lien Facility				$ 143,110,000			200,000,000		$ 200,000,000
Debt Instrument, Unamortized Discount				4,855,000			1,604,000
Unamortized Debt Issuance Expense				$ 4,327,000			3,299,000
First Lien Debt To E B I T D Ratio Maximum				2.50
Amortization Payment		$ 1,875,000
Write off of Deferred Debt Issuance Cost					$ 900,000
Senior Notes				$ 400,000,000		$ 400,000,000	$ 0
Senior Notes, Interest Rate				925.00%
Restricted Cash, Current				$ 15,439,000
Subsequent Event [Member]
Debt Disclosure [Line Items]
Senior Notes, Interest Rate	925.00%
Revolving Credit Facility
Debt Disclosure [Line Items]
Commitment fee				0.50%
Minimum [Member] | Revolving Credit Facility
Debt Disclosure [Line Items]
Interest rate				1.50%
Minimum [Member] | LIBOR | Revolving Credit Facility
Debt Disclosure [Line Items]
Applicable margin				2.50%
Maximum [Member] | Revolving Credit Facility
Debt Disclosure [Line Items]
Interest rate				2.50%
Maximum [Member] | LIBOR | Revolving Credit Facility
Debt Disclosure [Line Items]
Applicable margin				3.50%
Revolving Credit Facility
Debt Disclosure [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 375,000,000				$ 1,000,000,000
Interest Rate at Period End				3.09%
Revolving Credit Facility | Subsequent Event [Member]
Debt Disclosure [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600,000,000
Line of Credit Facility, Current Borrowing Capacity	350,000,000
Line of Credit Facility, Commitment Fee Amount	$ 400,000,000
Revolving Credit Facility | Interest Payable One [Member]
Debt Disclosure [Line Items]
Debt Instrument, Interest Payable Period				1 month
Revolving Credit Facility | Interest Payable Two [Member]
Debt Disclosure [Line Items]
Debt Instrument, Interest Payable Period				3 months
Revolving Credit Facility | Interest Payable Three [Member]
Debt Disclosure [Line Items]
Debt Instrument, Interest Payable Period				6 months
Line of Credit [Member] | Year 1 [Domain]
Debt Disclosure [Line Items]
Prepayment Premium				102.00%
Line of Credit [Member] | Letter of Credit
Debt Disclosure [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 25,000,000
Second Lien Facility [Member]
Debt Disclosure [Line Items]
Debt Issuance Costs, Line of Credit Arrangements, Gross		1,400,000
Interest rate option two, applicable margin rate				8.25%			7.25%
Interest rate option one, applicable margin rate over Adjusted LIBOR			9.25%	825.00%
Debt Instrument, Interest Rate Floor				1.00%
Repayments of Debt		$ 1,300,000
Asset Coverage Ratio		1.25
Second Lien Facility Interest Rate				9.25%
Write off Deferred Debt Issuance and Original Issuance Costs				$ 1,200,000
Payment for Debt Extinguishment or Debt Prepayment Cost		$ 50,000,000
Senior Notes
Debt Disclosure [Line Items]
Senior Notes, Interest Rate				9.25%		9.25%