Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2019	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	26,624	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					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)
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
Additions to outsource contract costs	(2,434)	(492)	(2,860)	(1,377)	(3,130)	(2,360)	(1,285)	(4,009)	(10,992)
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									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)
Net borrowings under factoring arrangement	1,118		2,426		(494)		3,307
Cash paid for withholding taxes on vested RSUs					(223)		(223)
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	43,854	81,489	43,854	81,489	43,854	81,489	43,854	81,489	34,252
End of period	13,260	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