Restatement of Previously Issued Financial Statements - Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net loss				$ (32,172)				$ (23,978)	$ (73,743)	$ (54,486)	$ (205,032)	$ (83,293)	$ (509,116)	$ (169,806)	$ (209,484)
Adjustments to reconcile net loss
Depreciation and amortization	$ 24,421	$ 25,079	$ 24,779	26,624	$ 33,684	$ 33,410	$ 34,744	36,239	51,403	70,982	76,482	104,393	100,903	138,077	98,890
Fees paid in stock															28,573
HGM contract termination fee paid in stock															10,000
Original issue discount and debt issuance cost amortization				2,852				2,595	5,749	5,272	8,730	8,062	11,777	10,913	12,280
Debt modification and extinguishment costs									1,049		1,049	103	1,049	103	34,459
Impairment of goodwill and other intangible assets	252,399	97,158			48,127						97,158		349,557	48,127	69,437
Provision for doubtful accounts				800				481	3,334	1,857	4,402	2,470	4,304	2,767	500
Deferred income tax provision				1,076				835	4,623	705	1,632	(3,689)	1,093	3,220	(67,545)
Share-based compensation expense				2,798				959	5,459	2,895	6,903	4,516	7,827	7,647	6,743
Foreign currency remeasurement				35				(323)	288	(1,156)	(173)	(2,040)	(511)	(1,180)	1,382
Loss (gain) on sale of assets				54				279	85	1,395	123	2,048	556	2,687	556
Fair value adjustment for interest rate swap				1,677				(3,328)	4,385	(4,675)	4,965	(5,456)	4,337	(2,540)	(1,297)
Additions to outsource contract costs				(2,434)				(492)	(2,860)	(1,377)	(3,130)	(2,360)	(1,285)	(4,009)	(10,992)
Change in operating assets and liabilities, net of effect from acquisitions
Accounts receivable				(8,742)				(10,875)	624	(19,813)	3,501	(6,374)	4,410	(19,319)	(4,832)
Prepaid expenses and other assets				(632)				(5,567)	1,260	(1,603)	2,377	(5,770)	(4,825)	(2,820)	1,029
Accounts payable and accrued liabilities				(33,033)				(18,205)	(12,595)	42,038	(41,146)	(21,348)	(19,588)	8,815	77,171
Related party payables				(1,551)				(273)	(3,899)	2,578	(5,198)	1,347	(14,339)	918	4,907
Net cash provided by (used in) operating activities				(42,648)				(21,653)	(14,838)	44,612	(47,357)	(7,391)	(63,851)	23,600	51,777
Cash flows from investing activities
Purchase of property, plant and equipment				(5,572)				(5,957)	(9,072)	(10,244)	(10,797)	(14,077)	(14,360)	(20,072)	(14,440)
Additions to internally developed software				(1,879)				(1,092)	(4,007)	(2,115)	(5,074)	(3,080)	(6,182)	(7,438)	(7,843)
Cash acquired in Quinpario reverse merger															91
Cash paid in acquisition, net of cash received									(5,000)	(4,145)	(5,000)	(6,513)	(5,000)	(34,810)	(423,797)
Proceeds from sale of assets				7				2	20	1,014	360	1,095	360	3,568	4,607
Net cash provided by (used in) investing activities				(7,444)				(7,047)	(18,059)	(15,490)	(20,511)	(22,575)	(25,182)	(58,752)	(441,382)
Cash flows from financing activities
Change in bank overdraft															(210)
Proceeds from issuance of stock															204,417
Cash received from Quinpario, net of transaction costs															22,333
Repurchases of common stock				(2,872)					(3,480)	(3,479)	(3,480)	(4,899)	(3,480)	(7,221)	(249)
Contribution from Shareholders															20,548
Cash paid for equity issuance costs								(7,500)		(7,500)		(7,500)		(7,500)	(149)
Lease terminations				(45)				(26)	(95)	(56)	(314)	(213)	(318)	(592)	(157)
Retirement of previous credit facilities															(1,055,736)
Cash paid for debt issuance costs									(7)		(7)	(130)	(7)	(130)	(38,784)
Principal payments on finance lease obligations				(5,077)				(4,803)	(9,180)	(8,404)	(13,598)	(12,594)	(20,465)	(16,068)	(11,361)
Borrowings from senior secured revolving facility				51,000				25,000	68,000	30,000	130,500	30,000	206,500	30,000	72,600
Repayments on senior secured revolving facility				(21,000)				(25,000)	(68,000)	(30,000)	(91,500)	(30,000)	(141,500)	(30,000)	(72,500)
Proceeds from issuance of notes															977,500
Proceeds from senior secured term loans									29,850		29,850	30,000	29,850	30,000	343,000
Borrowings from other loans				6,904				1,863	14,092	2,152	21,530	3,068	39,153	11,557	3,116
Principal repayments on senior secured term loans and other loans				(10,498)				(2,947)	(21,248)	(6,043)	(32,996)	(9,053)	(53,678)	(12,651)	(27,955)
Net cash provided by (used in) financing activities				19,530				(13,413)	12,358	(23,330)	39,268	(1,321)	59,139	(2,605)	436,413
Effect of exchange rates on cash				(32)				55	111	(410)	(29)	(555)	139	122	429
Net decrease in cash and cash equivalents				(30,594)				(42,058)	(20,428)	5,382	(28,629)	(31,842)	(29,755)	(37,635)	47,237
Cash, restricted cash, and cash equivalents
Beginning of period	15,225	23,426	13,260	43,854	49,647	86,871	39,431	81,489	43,854	81,489	43,854	81,489	43,854	81,489	34,252
End of period	14,099	15,225	23,426	13,260	43,854	49,647	86,871	39,431	23,426	86,871	15,225	49,647	14,099	43,854	81,489
Supplemental cash flow data:
Income tax payments, net of refunds received				1,356				1,053	5,181	3,864	6,981	5,296	7,882	7,827	5,711
Interest paid				60,573				66,192	71,211	76,353	131,744	136,396	144,456	146,076	69,622
Noncash investing and financing activities:
Assets acquired through right-of-use arrangements				4,097				4,432	6,778	7,787	9,352	9,318	10,732	14,920	6,973
Leasehold improvements funded by lessor										1,540		1,565		1,565	146
Issuance of common stock as consideration for Novitex															244,800
Accrued capital expenditures				809				1,101	1,083	1,144	2,388	1,994	1,402	2,820	1,621
Dividend equivalent on Series A Preferred Stock													0	0	16,375
Liability assumed of Quinpario															4,698
As previously reported
Cash flows from operating activities
Net loss				(29,907)				(23,994)	(64,054)	(49,175)	(197,479)	(78,116)		(162,517)	(204,285)
Adjustments to reconcile net loss
Depreciation and amortization		27,114	27,191	28,020	36,057	35,041	36,368	38,019	55,211	74,386	82,326	109,428		145,485	98,890
Fees paid in stock															23,875
HGM contract termination fee paid in stock															10,000
Original issue discount and debt issuance cost amortization				2,852				2,595	5,749	5,272	8,730	8,062		10,913	12,280
Debt modification and extinguishment costs									1,049		1,049
Impairment of goodwill and other intangible assets		99,682			48,127						99,682			48,127	69,437
Provision for doubtful accounts				800				481	3,334	1,857	4,402	2,470		2,767	500
Deferred income tax provision				1,076				835	4,623	705	1,632	(3,689)		3,352	(66,723)
Share-based compensation expense				2,798				959	5,459	2,895	6,903	4,516		7,647	6,743
Foreign currency remeasurement				35				(323)	288	(1,156)	(173)	(2,040)		(1,180)	1,382
Loss (gain) on sale of assets				9				253	(10)	1,340	(191)	1,835		2,095	399
Fair value adjustment for interest rate swap				1,677				(3,328)	4,385	(4,675)	4,965	(5,456)		(2,540)	(1,297)
Change in operating assets and liabilities, net of effect from acquisitions
Accounts receivable				(8,742)				(10,875)	624	(19,813)	3,501	(6,374)		(19,319)	(4,832)
Prepaid expenses and other assets				(632)				(5,567)	1,260	(1,603)	2,377	(5,770)		(2,820)	2,628
Accounts payable and accrued liabilities				(33,574)				(18,864)	(14,991)	40,677	(43,861)	(23,457)		5,157	69,551
Related party payables				(1,551)				(273)	(7,703)	(2,458)	(7,502)	(3,689)		(6,710)	4,907
Net cash provided by (used in) operating activities				(37,139)				(20,082)	(4,776)	48,252	(33,639)	(2,280)		30,457	23,455
Cash flows from investing activities
Purchase of property, plant and equipment				(5,572)				(5,957)	(9,072)	(10,244)	(10,797)	(14,077)		(20,072)	(14,440)
Additions to internally developed software				(1,879)				(1,092)	(4,007)	(2,115)	(5,074)	(3,080)		(7,438)	(7,843)
Additions to outsourcing contract costs				(5,561)				(1,596)	(10,440)	(3,695)	(14,304)	(5,427)		(7,552)	(10,992)
Cash acquired in Quinpario reverse merger															91
Cash paid in acquisition, net of cash received									(5,000)	(4,145)	(5,000)	(6,513)		(34,810)	(423,797)
Proceeds from sale of assets				7				2	20	1,014	360	1,095		3,568	4,607
Net cash provided by (used in) investing activities				(13,005)				(8,643)	(28,499)	(19,185)	(34,815)	(28,002)		(66,304)	(452,374)
Cash flows from financing activities
Change in bank overdraft															(210)
Loss on extinguishment of debt														1,067	35,512
Proceeds from issuance of stock															204,417
Cash received from Quinpario, net of transaction costs															27,031
Repurchases of common stock				(2,872)					(3,480)	(3,479)	(3,480)	(4,899)		(7,221)	(249)
Contribution from Shareholders															20,548
Cash paid for equity issuance costs								(7,500)		(7,500)		(7,500)		(7,500)	(149)
Retirement of previous credit facilities															(1,055,736)
Cash paid for debt issuance costs									(362)		(362)	(1,094)		(1,094)	(39,837)
Principal payments on finance lease obligations				(5,077)				(4,803)	(9,180)	(8,404)	(13,598)	(12,594)		(16,068)	(11,361)
Borrowings from senior secured revolving facility				51,000				25,000	68,000	30,000	130,500	30,000		30,000	72,600
Repayments on senior secured revolving facility				(21,000)				(25,000)	(68,000)	(30,000)	(91,500)	(30,000)		(30,000)	(72,500)
Proceeds from issuance of notes															977,500
Proceeds from senior secured term loans									29,850		29,850	30,000		30,000	343,000
Borrowings from other loans				566				1,863	1,544	2,152	1,728	3,068		11,557	3,116
Principal repayments on senior secured term loans and other loans				(4,153)				(2,947)	(8,417)	(6,043)	(12,922)	(9,053)		(12,651)	(27,955)
Net cash provided by (used in) financing activities				19,582				(13,387)	12,736	(23,274)	39,854	(1,005)		(1,910)	475,727
Effect of exchange rates on cash				(32)				55	111	(410)	(29)	(555)		122	429
Net decrease in cash and cash equivalents				(30,594)				(42,057)	(20,428)	5,383	(28,629)	(31,842)		(37,635)	47,237
Cash, restricted cash, and cash equivalents
Beginning of period	$ 15,225	23,426	13,260	43,854	49,647	86,872	39,432	81,489	43,854	81,489	43,854	81,489	$ 43,854	81,489	34,252
End of period		15,225	23,426	13,260	43,854	49,647	86,872	39,432	23,426	86,872	15,225	49,647		43,854	81,489
Supplemental cash flow data:
Income tax payments, net of refunds received				1,356				1,053	5,181	3,864	6,981	5,296		7,827	5,711
Interest paid				60,573				66,192	71,240	76,353	131,773	136,396		146,076	69,622
Noncash investing and financing activities:
Assets acquired through right-of-use arrangements				4,097				4,432	6,778	7,787	9,352	9,318		14,920	6,973
Leasehold improvements funded by lessor										1,540		1,565		1,565	146
Issuance of common stock as consideration for Novitex															244,800
Accrued capital expenditures				809				1,101	1,083	1,144	1,083	1,994		2,820	1,621
Dividend equivalent on Series A Preferred Stock															16,375
Liability assumed of Quinpario															4,672
Adjustment
Cash flows from operating activities
Net loss				(2,265)				16	(9,689)	(5,311)	(7,553)	(5,177)		(7,289)	(5,199)
Adjustments to reconcile net loss
Depreciation and amortization		(2,035)	$ (2,412)	(1,396)	$ (2,373)	(1,631)	(1,624)	(1,780)	(3,808)	(3,404)	(5,844)	(5,035)		(7,408)
Fees paid in stock															4,698
Debt modification and extinguishment costs									400			103		103	34,459
Impairment of goodwill and other intangible assets		$ (2,524)									(2,524)
Deferred income tax provision														(132)	(822)
Loss (gain) on sale of assets				45				26	95	55	314	213		592	157
Additions to outsource contract costs				(2,434)				(492)	(2,860)	(1,377)	(3,130)	(2,360)		(4,009)	(10,992)
Change in operating assets and liabilities, net of effect from acquisitions
Prepaid expenses and other assets															(1,599)
Accounts payable and accrued liabilities				541				659	2,396	1,361	2,715	2,109		3,658	7,620
Related party payables									3,804	5,036	2,304	5,036		7,628
Net cash provided by (used in) operating activities				(5,509)				(1,571)	(10,062)	(3,640)	(13,718)	(5,111)		(6,857)	28,322
Cash flows from investing activities
Additions to outsourcing contract costs				5,561				1,596	10,440	3,695	14,304	5,427		7,552	10,992
Net cash provided by (used in) investing activities				5,561				1,596	10,440	3,695	14,304	5,427		7,552	10,992
Cash flows from financing activities
Loss on extinguishment of debt														(1,067)	(35,512)
Cash received from Quinpario, net of transaction costs															(4,698)
Lease terminations				(45)				(26)	(95)	(56)	(314)	(213)		(592)	(157)
Cash paid for debt issuance costs									355		355	964		964	1,053
Borrowings from other loans				6,338					12,548		19,802
Principal repayments on senior secured term loans and other loans				(6,345)					(12,831)		(20,074)
Net cash provided by (used in) financing activities				$ (52)				(26)	(378)	(56)	(586)	$ (316)		$ (695)	(39,314)
Net decrease in cash and cash equivalents								(1)		(1)
Cash, restricted cash, and cash equivalents
Beginning of period						$ (1)	(1)
End of period							$ (1)	$ (1)		$ (1)
Supplemental cash flow data:
Interest paid									$ (29)		(29)
Noncash investing and financing activities:
Accrued capital expenditures											$ 1,305
Liability assumed of Quinpario															$ 26