Acquisitions and Divestitures - Divestitures (Details) - USD ($) $ / shares in Units, $ in Thousands									3 Months Ended				6 Months Ended
		Feb. 15, 2018	Nov. 14, 2017	Oct. 17, 2017	Feb. 01, 2017	Jan. 19, 2017	Dec. 29, 2016	Dec. 16, 2016	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 22, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on divestiture	[1]												$ (59,278)	$ (924)
Long-term debt											$ 226,998		226,998		$ 226,291
Discontinued operations, net of taxes	[1]										(6,775)	$ 18,985	(22,909)	17,799
Restricted cash															0
Contingent consideration obligation											$ 2,831		$ 2,831		$ 2,833
Common stock, shares outstanding (shares)											46,142,000		46,142,000		45,292,000
STIH
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indefinite-lived license agreements																$ 10,000
Subsequent Event | Convertible Preferred Stock
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Preferred stock, par value (in dollars per share)		$ 0.0001
Preferred stock, liquidation preference per share (in dollars per share)		$ 1,000
Goldman Sachs Bank USA | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges										$ 1,000
Gain from disposal of discontinued operation									$ 12,800
STIH | Goldman Sachs Bank USA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term debt								$ 40,000							$ 40,000
Silver Private Holdings I, LLC | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of stock, price per share (in dollars per share)				$ 14.56
Consideration received from sale of stock				$ 87,300
Silver Private Holdings I, LLC | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash exchange		$ 97,700
Silver Private Holdings I, LLC | Subsequent Event | Convertible Preferred Stock
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Shares issued as consideration		185,000
Silver Private Holdings I, LLC | Silver Private Holdings I, LLC | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common stock, shares outstanding (shares)		5,994,667
Intralinks Holdings, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity issued for consideration													$ 4,700	0
Total preliminary consideration transferred						$ 859,078
Total preliminary cash consideration transferred						854,376
Cash exchange						$ 39,370
Intralinks Holdings, Inc. | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent consideration obligation			$ 25,000
Derivative liability				33,600
Payment of reimbursement fees		$ 5,000	5,000
Intralinks Holdings, Inc. | Impala | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity issued for consideration				977,300
Contingent consideration obligation				25,000
Total preliminary consideration transferred				$ 1,000,000
Total preliminary cash consideration transferred			991,000
Potential cash proceeds			$ 440,000
Divestiture of SpeechCycle
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divestiture consideration					$ 13,500
Period of transition services agreement					1 year
Gain on divestiture					$ 4,900
BPO Divestiture | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period of continuing involvement after disposal								3 years
Net revenues												38,108		74,464
Cost of services												23,001		44,859
Selling, general and administrative												718		1,437
Total costs and expenses												23,719		46,296
Income/(Loss) from continuing operations, before taxes												14,389		28,168
Benefit (provision) for income taxes												4,596		(10,369)
Discontinued operations, net of taxes												$ 18,985		$ 17,799
BPO Divestiture | Discontinued Operations, Disposed of by Sale | Sequential Technology International, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divestiture consideration								$ 140,800
Investment percentage retained								30.00%
BPO Divestiture | Discontinued Operations, Disposed of by Sale | Sequential Technology International Holdings, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divestiture consideration								$ 27,300
Divestiture consideration, license								10,000
Proceeds from issuance of convertible notes								83,000
BPO Divestiture | Discontinued Operations, Disposed of by Sale | Sequential Technology International Holdings, LLC | Sequential Technology International, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divestiture consideration								$ 69,800
Investment percentage of majority shareholder								70.00%
Basis spread on variable rate											11.00%		11.00%
Mirapoint Activation Business Divestiture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of business							$ 1,400
Intralinks Holdings, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues											$ 64,952		$ 104,211
Cost of services											12,040		20,796
Research and development											7,029		12,452
Selling, general and administrative											40,050		69,518
Net change in contingent consideration obligation											0		0
Restructuring charges											7,407		15,433
Depreciation and amortization											12,552		22,690
Total costs and expenses											79,078		140,889
Loss from discontinued operations											(14,126)		(36,678)
Other income, net											657		927
Income/(Loss) from continuing operations, before taxes											(13,469)		(35,751)
Benefit (provision) for income taxes											6,694		12,842
Discontinued operations, net of taxes											$ (6,775)		$ (22,909)
Indirect Guarantee of Indebtedness | Goldman Sachs Bank USA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Guarantor obligations								$ 30,000
Sales | BPO Divestiture | Sequential Technology International Holdings, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expenses and losses recognized								$ 600

[1] See Note 4 -Acquisitions and Divestitures for transactions classified as held for sale.