Segment and Geographic Area Information - Revenue by segment information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)
Segment information
Number of segments | segment	3
Revenue	$ 258,811	$ 273,620
Cost of revenue (exclusive of depreciation and amortization)	201,988	216,467
Segment profit	56,823	57,153
Selling, general and administrative expenses (exclusive of depreciation and amortization)	40,854	44,381
Depreciation and amortization	13,507	16,560
Related party expense	2,391	3,112
Interest expense, net	21,088	44,180
Debt modification and extinguishment costs (gain), net		(8,773)
Sundry expense, net	1,881	748
Other income, net	(451)	(282)
Loss before income taxes	(22,447)	(42,773)
I T P S Segment
Segment information
Revenue	176,140	193,708
Cost of revenue (exclusive of depreciation and amortization)	144,412	158,511
Segment profit	31,728	35,197
H S Segment
Segment information
Revenue	64,852	63,043
Cost of revenue (exclusive of depreciation and amortization)	46,156	46,736
Segment profit	18,696	16,307
L L P S Segment
Segment information
Revenue	17,819	16,869
Cost of revenue (exclusive of depreciation and amortization)	11,420	11,220
Segment profit	$ 6,399	$ 5,649