Income Taxes - Summary of Tax Effects of Temporary Differences (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Intangible assets	$ 43,827	$ 51,494
Net operating losses	23,705	49,001
Capital loss carryforward		1,122
Compensation accruals	6,280	4,794
Investments	5,111	5,044
Other	1,581	83
Gross deferred tax assets	80,504	111,538
Valuation allowance	(35)	(1,611)	(3,300)
Gross deferred tax assets after valuation allowance	80,469	109,927
Deferred tax liabilities:
Intangible assets	(13,078)	(10,884)
Unrealized gains	(2,357)	(1,214)
Other investments	(534)	(906)
Gross deferred tax liabilities	(15,969)	(13,004)
Deferred tax assets (liability), net	$ 64,500	$ 96,923