Restatement of Previously Issued Financial Statements (Details) - USD ($)				1 Months Ended		3 Months Ended									6 Months Ended			9 Months Ended		12 Months Ended
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Restatement of Previously Issued Financial Statements
Revenue							$ 393,586,000	$ 373,545,000	$ 390,849,000	$ 404,357,000	$ 399,643,000	$ 383,030,000	$ 410,382,000	$ 393,167,000		$ 795,206,000	$ 803,549,000	$ 1,168,751,000	$ 1,186,579,000	$ 1,562,337,000	$ 1,586,222,000	$ 1,145,891,000
Cost of revenue							314,858,000	295,445,000	303,831,000	310,601,000	306,654,000	296,685,000	315,167,000	294,897,000		614,432,000	610,064,000	909,877,000	906,749,000	1,224,735,000	1,213,403,000	827,544,000
(Understatement) / overstatement of loss							$ (302,131,000)	$ (135,058,000)	$ (36,833,000)	$ (27,452,000)	$ (83,071,000)	$ (29,539,000)	$ (28,890,000)	$ (19,953,000)		(64,285,000)	(48,842,000)	(199,343,000)	(78,382,000)	$ (501,474,000)	$ (161,453,000)	$ (270,552,000)
(Understatement) / overstatement of loss per share							$ (2.09)	$ (0.91)	$ (0.29)	$ (0.23)	$ (0.59)	$ (0.20)	$ (0.21)	$ (0.17)						$ (3.52)	$ (1.17)	$ (2.18)
Related party expense							$ 1,742,000	$ 1,430,000	$ 5,331,000	$ 998,000	$ 3,664,000	$ 775,000	$ 6,783,000	$ 1,181,000		6,329,000	7,964,000	7,759,000	8,739,000	$ 9,501,000	$ 12,403,000	$ 33,431,000
Increase (Decrease) in Prepaid Expense and Other Assets										632,000				5,567,000		(1,260,000)	1,603,000	(2,377,000)	5,770,000	4,825,000	2,820,000	(1,029,000)
(Overstatement) / understatement of intangible assets, net							342,443,000	357,114,000	372,004,000	383,680,000	395,020,000	384,895,000	405,457,000	424,251,000	$ 342,443,000	372,004,000	405,457,000	357,114,000	384,895,000	342,443,000	395,020,000
Retained earnings							(1,211,508,000)	(907,422,000)	(776,134,000)	(734,563,000)	(702,392,000)	(615,058,000)	(586,253,000)	(555,744,000)	(1,211,508,000)	(776,134,000)	(586,253,000)	(907,422,000)	(615,058,000)	(1,211,508,000)	(702,392,000)
Increase in pension liabilities							25,681,000	28,850,000	27,141,000	27,730,000	27,641,000	32,887,000	32,967,000	28,540,000	25,681,000	27,141,000	32,967,000	28,850,000	32,887,000	25,681,000	27,641,000
Increase in interest expense							$ (43,216,000)	(40,573,000)	(39,959,000)	(39,701,000)	(38,999,000)	(39,087,000)	(39,229,000)	(38,676,000)		(79,660,000)	(77,905,000)	(120,235,000)	(116,992,000)	(163,449,000)	(155,991,000)	(129,676,000)
Increase/ (decrease) to net cash flows provided investing activities										(7,444,000)				(7,047,000)		(18,059,000)	(15,490,000)	(20,511,000)	(22,575,000)	(25,182,000)	(58,752,000)	(441,382,000)
Increase/ (decrease) to net cash flows provided by financing activities										19,530,000				(13,413,000)		12,358,000	(23,330,000)	39,268,000	(1,321,000)	59,139,000	(2,605,000)	436,413,000
Increase/ (decrease) to net cash flows provided operating activities										(42,648,000)				(21,653,000)		(14,838,000)	44,612,000	(47,357,000)	(7,391,000)	(63,851,000)	23,600,000	51,777,000
ASU 2016-15
Restatement of Previously Issued Financial Statements
Increase/ (decrease) to net cash flows provided by financing activities																						(34,500,000)
Increase/ (decrease) to net cash flows provided operating activities																						34,500,000
Adjustment
Restatement of Previously Issued Financial Statements
Revenue								628,000	689,000	592,000						1,282,000		1,910,000				(6,433,000)
Cost of revenue								4,223,000	5,825,000	3,719,000	462,000	749,000	1,213,000	1,105,000		9,544,000	2,318,000	13,767,000	3,067,000		3,529,000	(1,599,000)
(Understatement) / overstatement of loss								2,138,000	(7,425,000)	(2,265,000)	(2,166,000)	134,000	(5,327,000)	16,000		(9,689,000)	(5,311,000)	(7,553,000)	(5,177,000)		$ (7,343,000)	$ (6,021,000)
(Understatement) / overstatement of loss per share																					$ (0.08)	$ (0.10)
Related party expense								25,000	4,276,000	4,000	2,596,000	16,000	5,381,000	76,000		4,280,000	5,457,000	4,305,000	5,472,000		$ 8,069,000
Increase (Decrease) in Prepaid Expense and Other Assets																						$ 1,599,000
(Overstatement) / understatement of intangible assets, net								(17,331,000)	(15,771,000)	(13,732,000)	(12,001,000)	(13,385,000)	(14,268,000)	(14,678,000)		(15,771,000)	(14,268,000)	(17,331,000)	(13,385,000)		(12,001,000)
Retained earnings								(31,379,000)	(33,518,000)	(26,776,000)	(23,829,000)	(20,896,000)	(21,031,000)	(15,703,000)		(33,518,000)	(21,031,000)	(31,379,000)	(20,896,000)		(23,829,000)
Increase in pension liabilities								2,183,000	2,275,000	2,216,000	2,372,000	2,511,000	2,496,000	2,459,000		2,275,000	2,496,000	2,183,000	2,511,000		2,372,000
Increase in interest expense								(826,000)	(827,000)	(802,000)	(787,000)	(748,000)	(702,000)	(659,000)		(1,629,000)	(1,361,000)	(2,457,000)	(2,109,000)		(2,896,000)	(1,187,000)
Decrease in net income																					2,100,000	5,200,000
Increase/ (decrease) to net cash flows provided investing activities										5,561,000				1,596,000		10,440,000	3,695,000	14,304,000	5,427,000		7,552,000	10,992,000
Increase/ (decrease) to net cash flows provided by financing activities										(52,000)				(26,000)		(378,000)	(56,000)	(586,000)	(316,000)		(695,000)	(39,314,000)
Increase/ (decrease) to net cash flows provided operating activities										(5,509,000)				(1,571,000)		(10,062,000)	(3,640,000)	(13,718,000)	(5,111,000)		(6,857,000)	28,322,000
Adjustment | ASU 2016-15
Restatement of Previously Issued Financial Statements
Increase/ (decrease) to net cash flows provided by financing activities																					(100,000)
Increase/ (decrease) to net cash flows provided operating activities																					100,000
Selling, general and administrative expense
Restatement of Previously Issued Financial Statements
Related party expense																		500,000		$ 400,000
Appraisal Action Liability Adjustments
Restatement of Previously Issued Financial Statements
(Understatement) / overstatement of loss																		(2,400,000)			(2,900,000)	(1,200,000)
Increase in accrued liabilities																		43,100,000			40,600,000	37,800,000
Increase in accrued liabilities																		43,100,000			40,600,000	37,800,000
Increase in interest expense																					2,900,000	1,200,000
Appraisal Action Liability Adjustments | Novitex | Source HOV Tax, LLC
Restatement of Previously Issued Financial Statements
Fair value of common stock per share		$ 4,591
Appraisal Action Liability Adjustments | Novitex | Petitioners
Restatement of Previously Issued Financial Statements
Number of shares owned			10,304
Amount awarded to petitioners	$ 57,698,426
Appraisal Action Liability Adjustments | Ex-Sigma 2, LLC | Source HOV Tax, LLC
Restatement of Previously Issued Financial Statements
Decrease in shares outstanding						4,570,734
Shares returned to company						4,570,734
Appraisal Action Liability Adjustments | Adjustment
Restatement of Previously Issued Financial Statements
Increase in accrued liabilities								43,100,000	42,300,000	41,500,000		39,900,000	39,100,000	38,400,000
Increase in accrued liabilities								43,100,000	42,300,000	41,500,000		39,900,000	39,100,000	38,400,000
Expense Reimbursement Adjustments
Restatement of Previously Issued Financial Statements
Increase in related party payables								9,900,000	11,400,000		7,600,000					11,400,000		9,900,000			7,600,000
Related party expense									4,300,000										5,500,000
Expense Reimbursement Adjustments | Ex-Sigma 2, LLC
Restatement of Previously Issued Financial Statements
Increase in related party payables										7,600,000	7,600,000	5,000,000	5,000,000				5,000,000		5,000,000		7,600,000
Payment of selling, general and administrative expenses				$ 1,500,000
(Understatement) / overstatement of loss																		1,700,000			5,200,000
Related party expense															4,500,000
Expense Reimbursement Adjustments | Ex-Sigma 2, LLC | Secondary Public Offering
Restatement of Previously Issued Financial Statements
Related party expense															$ 4,500,000
Underwriting discount and commission expenses					$ 2,100,000
Advisory fees					$ 300,000
Expense related to discount to market price									2,100,000
Expense Reimbursement Adjustments | Adjustment
Restatement of Previously Issued Financial Statements
Increase in related party payables								9,900,000	11,400,000	7,600,000		5,000,000	5,000,000			11,400,000	5,000,000	9,900,000	5,000,000
(Understatement) / overstatement of loss								1,500,000	(2,100,000)												(2,400,000)
Related party expense									2,100,000				5,400,000			4,300,000	5,500,000				2,400,000
Increase in related party payables											2,600,000			100,000							8,100,000
Revenue Recognition Adjustments
Restatement of Previously Issued Financial Statements
Revenue																						6,400,000
Cost of revenue																						1,600,000
Increase / (decrease) in cost of revenue																						(1,600,000)
Revenue Recognition Adjustments | Adjustment
Restatement of Previously Issued Financial Statements
Revenue								600,000	700,000	600,000						1,300,000		1,900,000				(6,400,000)
Cost of revenue								600,000	700,000	600,000						1,300,000		1,900,000
(Understatement) / overstatement of loss																						(4,800,000)
Increase (Decrease) in Prepaid Expense and Other Assets																						1,600,000
Deferred revenue																						(6,400,000)
Outsourced Contract Cost Adjustments
Restatement of Previously Issued Financial Statements
(Overstatement) / understatement of intangible assets, net											(12,000,000)										(12,000,000)
Additions to outsourcing contract costs																					4,000,000
Depreciation and amortization																					7,400,000
Increase / (decrease) in cost of revenue																					4,200,000
Decrease in depreciation and amortization																					7,400,000
Increase/ (decrease) to net cash flows provided investing activities																					7,600,000	11,000,000
Increase/ (decrease) to net cash flows provided operating activities																					(11,400,000)	(11,000,000)
Outsourced Contract Cost Adjustments | Adjustment
Restatement of Previously Issued Financial Statements
Revenue								3,600,000		3,100,000
Cost of revenue									4,500,000		1,200,000	700,000	1,200,000	1,100,000		7,600,000		11,200,000	3,000,000
(Understatement) / overstatement of loss																		5,300,000			3,200,000
(Overstatement) / understatement of intangible assets, net								17,300,000			12,000,000							17,300,000			12,000,000
Retained earnings											(15,400,000)										(15,400,000)
Increase/ (decrease) to net cash flows provided operating activities										(3,800,000)				2,300,000		6,700,000	4,800,000	8,900,000	7,400,000
Cash Flows Classification Adjustments
Restatement of Previously Issued Financial Statements
Increase/ (decrease) to net cash flows provided investing activities																					7,500,000	11,000,000
Increase/ (decrease) to net cash flows provided by financing activities																						34,500,000
Increase/ (decrease) to net cash flows provided operating activities																		14,300,000			100,000
Other Adjustment
Restatement of Previously Issued Financial Statements
Increase in accrued liabilities																					700,000
Increase in cash and cash equivalents																					10,600,000
Decrease in restricted cash																					10,600,000
Decrease in accrued compensation and benefits																					2,400,000
Increase in pension liabilities											2,400,000										2,400,000
Decrease in other long-term liabilities																					700,000
Increase in accrued liabilities																					700,000
Increase / (decrease) in cost of revenue																					(700,000)
Increase in selling, general and administrative expense																					300,000
Increase in income tax expense																						800,000
Other Adjustment | Adjustment
Restatement of Previously Issued Financial Statements
Cost of revenue									700,000		$ 700,000					700,000		700,000
Related party expense																		4,300,000
Increase in accrued liabilities									500,000	400,000
Increase in cash and cash equivalents								1,000,000	40,000	300,000		500,000	1,200,000	2,100,000
Decrease in accrued compensation and benefits								2,200,000	2,300,000	2,200,000		2,500,000	2,500,000	2,500,000
Increase in pension liabilities								$ 2,200,000	2,300,000	2,200,000		$ 2,500,000	$ 2,500,000	$ 2,500,000		$ 2,300,000	$ 2,500,000	$ 2,200,000	$ 2,500,000
Increase in accrued liabilities									$ 500,000	$ 400,000
Lease Termination Adjustments
Restatement of Previously Issued Financial Statements
Increase/ (decrease) to net cash flows provided by financing activities																					(600,000)	(200,000)
Increase/ (decrease) to net cash flows provided operating activities																					$ 600,000	200,000
Fees Paid To Quinpario
Restatement of Previously Issued Financial Statements
Increase/ (decrease) to net cash flows provided by financing activities																						(4,700,000)
Increase/ (decrease) to net cash flows provided operating activities																						$ 4,700,000