Segment and Geographic Area Information - Revenue by segment information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)
Segment information
Number of segments | segment	3
Revenue	$ 1,064,124	$ 1,077,157
Cost of revenue (exclusive of depreciation and amortization)	833,422	877,474
Segment profit	230,702	199,683
Selling, general and administrative expenses (exclusive of depreciation and amortization)	150,672	176,524
Depreciation and amortization	60,535	71,831
Impairment of goodwill and other intangible assets		171,182
Related party expense	11,444	8,923
Interest expense, net	139,656	164,870
Debt modification and extinguishment costs (gain),net	(16,129)	4,522
Sundry expense, net	973	(957)
Other income, net	(884)	14,170
Loss before income taxes	(115,565)	(411,382)
I T P S Segment
Segment information
Revenue	732,319	765,134
Cost of revenue (exclusive of depreciation and amortization)	599,320	633,673
Segment profit	132,999	131,461
H S Segment
Segment information
Revenue	251,380	239,270
Cost of revenue (exclusive of depreciation and amortization)	185,796	190,835
Segment profit	65,584	48,435
L L P S Segment
Segment information
Revenue	80,425	72,753
Cost of revenue (exclusive of depreciation and amortization)	48,306	52,966
Segment profit	$ 32,119	$ 19,787