Ownership Interests in and Advances to Partner Companies and Funds - Results of Operations for PixelOptics (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2013
Results of Operations:
Revenue	$ 320,702	$ 273,764	$ 191,928
Net loss	(108,458)	(63,452)	(79,662)
PixelOptics, Inc. [Member]
Results of Operations:
Revenue			1,092	800
Operating loss			(32,225)	(12,219)
Net loss			$ (35,472)	$ (14,838)