Income Taxes - Tax Effects of Temporary Differences (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred tax assets:
Intangible assets	$ 51,494	$ 65,380
Net operating losses	49,001	63,886
Capital loss carryforward	1,122	1,760
Other	8,707	9,139
Gross deferred tax assets	110,324	140,165
Valuation allowance	(1,611)	(3,336)
Gross deferred tax assets after valuation allowance	108,713	136,829	93,000
Deferred tax liabilities:
Intangible assets	(10,884)	(12,131)
Other investments	(906)	(1,006)
Gross deferred tax liabilities	(11,790)	(13,137)
Deferred tax assets (liability), net	$ 96,923	$ 123,692