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Earnings per Common Share (Details) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
		Aug. 12, 2014	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]
Net loss from continuing operations			$ (22,608)	$ (14,293)	$ (68,060)	$ (45,443)
Net loss attributable to redeemable noncontrolling interests			(2,815)	(3,140)	(5,704)	(6,147)
Net loss from continuing operations attributable to Synchronoss			(19,793)	(11,153)	(62,356)	(39,296)
Income effect for interest on convertible debt, net of tax			0	0		0
Net loss from continuing operations adjusted for the convertible debt			(19,793)	(11,153)	(62,356)	(39,296)
(Loss) Income from discontinued operations, net of taxes	[1]		(6,775)	18,985	(22,909)	17,799
Net loss attributable to Synchronoss			(26,568)	7,832	(85,265)	(21,497)
Net loss attributable to Synchronoss, Diluted			$ (26,568)	$ 7,832	$ (85,265)	$ (21,497)
Weighted-average common shares outstanding:
Weighted average common shares outstanding - basic (shares) | shares			44,618,000	43,450,000	44,416,000	43,430,000
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Shares from assumed conversion of convertible debt (shares) | shares			0	0	0	0
Options and unvested restricted shares (shares) | shares			0	0	0	0
Weighted average common shares outstanding - diluted (shares) | shares			44,618,000	43,450,000	44,416,000	43,430,000
Basic:
Continuing operations (usd per share) | $ / shares			$ (0.44)	$ (0.26)	$ (1.40)	$ (0.90)
Discontinued operations (usd per share) | $ / shares	[1]		(0.16)	0.44	(0.52)	0.41
Basic (usd per share) | $ / shares			(0.60)	0.18	(1.92)	(0.49)
Diluted:
Continuing operations (usd per share) | $ / shares			(0.44)	(0.26)	(1.40)	(0.90)
Discontinued operations (usd per share) | $ / shares	[1]		(0.16)	0.44	(0.52)	0.41
Diluted (usd per share) | $ / shares			$ (0.60)	$ 0.18	$ (1.92)	$ (0.49)
Employee Stock Option
Diluted:
Anti-dilutive stock options excluded (shares) | shares			2,989,000	1,942,000	2,349,000	1,785,000
Non-vested shares of restricted stock awards and restricted stock units excluded
Diluted:
Anti-dilutive stock options excluded (shares) | shares			2,250,000	1,979,000	2,250,000	1,979,000
2019 Notes
Diluted:
Conversion ratio		0.0188072			0.0188072
Convertible Debt Securities
Diluted:
Anti-dilutive stock options excluded (shares) | shares					4,325,646
[1] See Note 4 -Acquisitions and Divestitures for transactions classified as held for sale.

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