CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) (Unaudited) Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (41,264)	$ (29,383)	$ (79,241)	$ (90,969)
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(7,857)	9,064	(4,985)	12,724
Unrealized (loss) gain on available for sale securities	(28)	10	(49)	18
Net (loss) income on intra-entity foreign currency transactions	(1,360)	1,160	(531)	1,353
Total comprehensive loss	(9,245)	10,234	(5,565)	14,095
Comprehensive loss	(50,509)	(19,149)	(84,806)	(76,874)
Comprehensive loss attributable to redeemable noncontrolling interests	1,259	2,815	2,544	5,704
Comprehensive loss attributable to Synchronoss	$ (49,250)	$ (16,334)	$ (82,262)	$ (71,170)