Accumulated Other Comprehensive Income (Loss) - Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Comprehensive income (loss)
Net income (loss) attributable to Synchronoss	$ 7,676	$ 9,645	$ (4,717)	$ 35,360
Translation adjustments	2,645	(971)	6,089	(11,681)
Unrealized gain on securities, (net of tax)	147	255	145	389
Net income (loss) on intra-entity foreign currency transactions, (net of tax)	300	65	662	(2,047)
Total comprehensive income attributable to Synchronoss	$ 10,768	$ 8,994	$ 2,179	$ 22,021