Deferred Income Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred income tax assets:
Net operating loss and tax credit carryforwards	$ 148,060	$ 219,054
Stock-based compensation expense	66,583	81,910
Non-deductible reserves and expenses	431,374	265,751
Depreciation expense	22,937	21,386
Unrealized investment gains	2,878	3,584
Intangible assets	7,764	5,861
Gross deferred income tax assets	679,596	597,546
Valuation allowance	(36,690)	(51,503)
Deferred income tax assets	642,906	546,043
Deferred income tax liabilities:
Purchased intangible assets	(156,435)	(29,960)
Depreciation expense	(86,641)	(118,808)
Investments in equity interests	(323,368)	(13,120)
Restructuring liabilities	(7,235)	(6,547)
Deferred income tax liabilities	(573,679)	(168,435)
Net deferred income tax assets	$ 69,227	$ 377,608