Net Income (Loss) Per Share - Historical Computation of Basic and Diluted Net Income (Loss) Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income (loss) attributable to Intrexon	$ (52,725)	$ 15,498	$ (100,653)	$ (26,776)
Accretion of dividends on redeemable convertible preferred stock	0	(4,044)	0	(18,391)
Undistributed earnings allocated to preferred shareholders	0	(3,132)	0	0
Net income (loss) attributable to common shareholders	$ (52,725)	$ 8,322	$ (100,653)	$ (45,167)
Denominator:
Weighted average shares outstanding, basic	99,888,203	54,305,354	98,711,564	22,056,396
Weighted average effect of dilutive stock options and warrants	0	1,845,642	0	0
Weighted average shares outstanding, diluted	99,888,203	56,150,996	98,711,564	22,056,396
Net income (loss) attributable to common shareholders per share, basic (in dollars per share)	$ (0.53)	$ 0.15	$ (1.02)	$ (2.05)
Net income (loss) attributable to common shareholders per share, diluted (in dollars per share)	$ (0.53)	$ 0.15	$ (1.02)	$ (2.05)