Supplemental Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 1,423	$ 273
Income taxes paid	54	1,582
Reclassification of available-for-sale securities to equity method investment	27,647	0
Securities received in exchange for financial instrument obligations	19,341	0
Repurchase of common stock from Reverse Split not paid	10,023	0
Contribution of advances by non-controlling interest	268	0
Restricted stock awards surrendered to satisfy tax withholding obligations upon vesting	$ 14	$ 0