Business Segments and Geographic Information - Schedule of Reconciliation of Total Operating Income from its Reportable Segments to Income Before Income Taxes and Equity in Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Revenues	$ 604,647	$ 605,672	$ 605,672
Unallocated amounts:
General and administrative expenses	(57,749)	(53,070)
Net interest expense	(40,444)	(48,821)
Loss on extinguishment of debt	0	(39)
Net loss on asset divestitures/impairment	0
Income before income taxes and equity in earnings of affiliates	20,540	30,702
Depreciation and amortization	32,136	31,365
Electronic Monitoring and Supervision Services
Segment Reporting Information [Line Items]
Revenues	77,713		86,784
Reentry Services
Segment Reporting Information [Line Items]
Revenues	70,376		$ 67,830
Operating Segments
Segment Reporting Information [Line Items]
Revenues	604,647	605,672
Operating Expenses [Abstract]
Labor and Related Taxes	314,228	302,320
Medical Services and Supplies	14,406	18,721
Other Segment Items	157,280	151,999
Operating Income from Segments	118,733	132,632
Unallocated amounts:
Capital Expenditures	30,771	14,768
Operating Segments | U.S. Secure Services
Segment Reporting Information [Line Items]
Revenues	405,716	400,940
Operating Expenses [Abstract]
Labor and Related Taxes	230,397	219,009
Medical Services and Supplies	14,406	18,721
Other Segment Items	91,682	83,969
Operating Income from Segments	69,231	79,241
Unallocated amounts:
Capital Expenditures	19,313	5,773
Operating Segments | Electronic Monitoring and Supervision Services
Segment Reporting Information [Line Items]
Revenues	77,713	86,784
Operating Expenses [Abstract]
Labor and Related Taxes	23,387	22,457
Medical Services and Supplies
Other Segment Items	24,337	26,147
Operating Income from Segments	29,989	38,180
Unallocated amounts:
Capital Expenditures	9,976	6,729
Operating Segments | Reentry Services
Segment Reporting Information [Line Items]
Revenues	70,376	67,830
Operating Expenses [Abstract]
Labor and Related Taxes	31,755	31,552
Medical Services and Supplies
Other Segment Items	23,519	23,536
Operating Income from Segments	15,102	12,742
Unallocated amounts:
Capital Expenditures	977	1,641
Operating Segments | International Services
Segment Reporting Information [Line Items]
Revenues	50,842	50,118
Operating Expenses [Abstract]
Labor and Related Taxes	28,689	29,302
Medical Services and Supplies
Other Segment Items	17,742	18,347
Operating Income from Segments	4,411	2,469
Unallocated amounts:
Capital Expenditures	505	625
Segment Reconciling Items
Unallocated amounts:
Depreciation and amortization	32,136	31,365
Segment Reconciling Items | U.S. Secure Services
Unallocated amounts:
Depreciation and amortization	22,275	20,567
Segment Reconciling Items | Electronic Monitoring and Supervision Services
Unallocated amounts:
Depreciation and amortization	5,862	6,517
Segment Reconciling Items | Reentry Services
Unallocated amounts:
Depreciation and amortization	3,442	3,636
Segment Reconciling Items | International Services
Unallocated amounts:
Depreciation and amortization	$ 557	$ 645