Consolidated Majority-Owned Subsidiaries - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended			0 Months Ended				3 Months Ended					9 Months Ended	0 Months Ended			0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Mar. 20, 2014 AquaBounty Technologies, Inc.	Mar. 15, 2013 AquaBounty Technologies, Inc.	Nov. 29, 2012 AquaBounty Technologies, Inc.	Nov. 16, 2012 AquaBounty Technologies, Inc.	Feb. 28, 2013 AquaBounty Technologies, Inc.	Sep. 30, 2014 AquaBounty Technologies, Inc.	Mar. 20, 2014 AquaBounty Technologies, Inc.	Mar. 15, 2013 AquaBounty Technologies, Inc.	Nov. 16, 2012 AquaBounty Technologies, Inc.	Sep. 30, 2014 AquaBounty Technologies, Inc. In-process research and development	Oct. 01, 2013 Biological & Popular Culture, Inc.	Sep. 30, 2014 Biological & Popular Culture, Inc.	Oct. 01, 2013 Biological & Popular Culture, Inc.	Oct. 01, 2013 Biological & Popular Culture, Inc. Patents, related technologies, and know-how
Business Acquisition [Line Items]
Number of shares acquired												19,040,366	18,714,814	48,631,444
Percentage of outstanding shares														47.56%
Definitive purchase agreement amount									$ 6,000
Amount of loan allowed in promissory note								500
Annual interest rate								3.00%
Maturity date of promissory note								May 28, 2013
Amount drawn on promissory note										500
Promissory note repaid			0	500			500
Cash						10,000	4,907									1,300
Aggregate percentage of ownership												59.85%	53.82%
Gain recognized	0	0	0	7,415			7,415
Percentage of equity interest previously held													47.56%
Expected useful life of intangible asset															15 years
Percentage of outstanding common stock acquired											60.00%						51.00%	51.00%
Goodwill	98,778		98,778		13,823													822
Intangible assets																		$ 430
Acquired Intangible Assets, useful life																			4 years