Segment and Geographic Area Information - Revenue by segment information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)
Segment information
Number of segments | segment			3
Revenue	$ 264,038	$ 279,229	$ 810,206	$ 872,294
Cost of revenue (exclusive of depreciation and amortization)	217,842	211,731	658,623	653,398
Segment profit	46,196	67,498	151,583	218,896
Selling, general and administrative expenses (exclusive of depreciation and amortization)	44,369	43,244	137,604	121,519
Depreciation and amortization	17,737	19,094	53,942	58,113
Impairment of goodwill and other intangible assets	29,565		29,565
Related party expense	2,016	2,744	6,189	7,199
Interest expense, net	40,897	41,757	122,928	127,755
Debt modification and extinguishment costs (gain), net	(4,696)	(28,070)	4,305	(28,070)
Sundry expense (income), net	781	136	347	(438)
Other expense (income), net	(1,115)	366	12,419	1,169
Net loss before income taxes	(83,358)	(11,773)	(215,716)	(68,351)
I T P S Segment
Segment information
Revenue	185,309	208,304	580,320	657,438
Cost of revenue (exclusive of depreciation and amortization)	157,269	157,721	477,559	499,892
Segment profit	28,040	50,583	102,761	157,546
H S Segment
Segment information
Revenue	60,955	53,995	173,940	161,292
Cost of revenue (exclusive of depreciation and amortization)	48,316	41,945	140,767	116,736
Segment profit	12,639	12,050	33,173	44,556
L L P S Segment
Segment information
Revenue	17,774	16,930	55,946	53,564
Cost of revenue (exclusive of depreciation and amortization)	12,257	12,065	40,297	36,770
Segment profit	$ 5,517	$ 4,865	$ 15,649	$ 16,794