Restatement - Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 23,245	$ 22,752	$ 36,834	$ 28,621
Other comprehensive loss:
Foreign currency translation adjustments		(10,555)		(17,063)
Net unrealized gain on available-for-sale investments, net of taxes	19	52	42	56
Reclassification adjustment for realized loss on available-for-sale investments, net of taxes	0	28	0	28
Net gain on available-for-sale investments	19	80	42	84
Other comprehensive income (loss)	3,611	(10,475)	7,075	(16,979)
Total comprehensive income	26,856	12,277	43,909	11,642
Comprehensive loss attributable to noncontrolling interest	(19)	(155)	(36)	(190)
Comprehensive income attributable to stockholders of Sapient Corporation	26,875	12,432	43,945	11,832
As Reported [Member]
Statement of Comprehensive Income [Abstract]
Net income		23,287		29,817
Other comprehensive loss:
Foreign currency translation adjustments		(10,555)		(17,063)
Net unrealized gain on available-for-sale investments, net of taxes		52		56
Reclassification adjustment for realized loss on available-for-sale investments, net of taxes		28		28
Net gain on available-for-sale investments		80		84
Other comprehensive income (loss)		(10,475)		(16,979)
Total comprehensive income		12,812		12,838
Comprehensive loss attributable to noncontrolling interest		(155)		(190)
Comprehensive income attributable to stockholders of Sapient Corporation		12,967		13,028
Adjustments [Member]
Statement of Comprehensive Income [Abstract]
Net income		(535)		(1,196)
Other comprehensive loss:
Foreign currency translation adjustments		0		0
Net unrealized gain on available-for-sale investments, net of taxes		0		0
Reclassification adjustment for realized loss on available-for-sale investments, net of taxes		0		0
Net gain on available-for-sale investments		0		0
Other comprehensive income (loss)		0		0
Total comprehensive income		(535)		(1,196)
Comprehensive loss attributable to noncontrolling interest		0		0
Comprehensive income attributable to stockholders of Sapient Corporation		$ (535)		$ (1,196)