Segment and Geographic Area Information - Revenue by segment information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)
Segment information
Number of segments | segment			3
Revenue	$ 266,770	$ 293,009	$ 546,168	$ 593,065
Cost of revenue (exclusive of depreciation and amortization)	217,277	209,080	440,781	441,667
Segment profit	49,493	83,929	105,387	151,398
Selling, general and administrative expenses (exclusive of depreciation and amortization)	50,195	36,390	93,235	78,275
Depreciation and amortization	17,993	19,420	36,205	39,019
Related party expense	2,186	2,748	4,173	4,455
Interest expense, net	42,271	42,867	82,031	85,998
Sundry income, net	(741)	(787)	(434)	(574)
Other expense, net	7,375	651	13,534	803
Net loss before income taxes	(77,903)	(17,360)	(132,358)	(56,578)
I T P S Segment [Member]
Segment information
Revenue	190,005	217,260	395,012	449,135
Cost of revenue (exclusive of depreciation and amortization)	156,704	156,669	320,290	342,171
Segment profit	33,301	60,591	74,722	106,964
H S Segment [Member]
Segment information
Revenue	56,390	56,204	112,986	107,297
Cost of revenue (exclusive of depreciation and amortization)	45,719	38,973	92,450	74,791
Segment profit	10,671	17,231	20,536	32,506
L L P S Segment [Member]
Segment information
Revenue	20,375	19,545	38,170	36,633
Cost of revenue (exclusive of depreciation and amortization)	14,854	13,438	28,041	24,705
Segment profit	$ 5,521	$ 6,107	$ 10,129	$ 11,928