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Mergers and Acquisitions - Disclosure - Pro Forma Financial Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Loss before income taxes									$ (85,719)	$ (40,908)	$ (81,874)
Net loss	17,932us-gaap_ProfitLoss	(53,862)us-gaap_ProfitLoss	(52,935)us-gaap_ProfitLoss	3,249us-gaap_ProfitLoss	(13,018)us-gaap_ProfitLoss	14,991us-gaap_ProfitLoss	(6,519)us-gaap_ProfitLoss	(36,362)us-gaap_ProfitLoss	(85,616)us-gaap_ProfitLoss	(40,908)us-gaap_ProfitLoss	(81,874)us-gaap_ProfitLoss
Net loss attributable to the noncontrolling interests									3,794	1,928	0
Accretion of dividends on redeemable convertible preferred stock									0	(18,391)	(21,994)
Net loss attributable to common shareholders									(81,822)	(57,371)	(103,868)
Pro Forma
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues									119,721	86,991
Loss before income taxes									(82,041)	(41,718)
Net loss									(81,938)	(41,718)
Net loss attributable to the noncontrolling interests									4,159	2,766
Net loss attributable to Intrexon									(77,779)	(38,952)
Accretion of dividends on redeemable convertible preferred stock									0	(18,391)
Net loss attributable to common shareholders									$ (77,779)	$ (57,343)