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Amount, after accumulated amortization, of debt discount (premium).

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Schedule of Debt Outstanding (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 29, 2021	Dec. 31, 2020	Dec. 18, 2019
Debt Instrument [Line Items]
Total debt	$ 1,650,190		$ 1,809,517
Unamortized debt issuance costs	(22,946)		(12,766)
Net unamortized original issue discount	(7,196)		(10,000)
Current portion of long-term debt	(33,685)		(39,087)
Long-term debt, net	1,586,363		1,747,664
Term Loan A Due in April 2023
Debt Instrument [Line Items]
Total debt	172,500		180,000
Unamortized debt issuance costs	(0)		(100)
Term Loan B Due in December 2024
Debt Instrument [Line Items]
Total debt	223,438		237,500	$ 250,000
Unamortized debt issuance costs	(3,300)		(4,100)
Senior Notes 4.625% Due 2023
Debt Instrument [Line Items]
Total debt	174,012		350,000
Unamortized debt issuance costs	(500)		(1,500)
Senior Notes 5.0% Redeemed in April 2021
Debt Instrument [Line Items]
Total debt			250,000
Unamortized debt issuance costs			(800)
Senior Notes 4.75% Due 2027
Debt Instrument [Line Items]
Total debt	250,000		250,000
Unamortized debt issuance costs	(2,400)		(2,700)
8.25% Senior Notes Due 2026
Debt Instrument [Line Items]
Total debt	675,000	$ 675,000
Unamortized debt issuance costs	(13,700)
4.5% Capital Commerce Center Non-Recourse Mortgage Note
Debt Instrument [Line Items]
Total debt			20,934
Unamortized debt issuance costs			(300)
Lansing Correctional Center Non Recourse Mortgage Note 4.43% Due 2040
Debt Instrument [Line Items]
Total debt	155,240		157,607
Unamortized debt issuance costs	$ (3,000)		(3,100)
4.5% SSA-Baltimore Non-Recourse Mortgage Note
Debt Instrument [Line Items]
Total debt			144,476
Unamortized debt issuance costs			(200)
Revolving Credit Facility \| Revolving Credit Facility Due in April 2023
Debt Instrument [Line Items]
Total debt			$ 219,000