Income Taxes - Components of Company's Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Tax credit carryovers	$ 413,225	$ 408,444
Net operating loss carryforwards	968,648	989,989
Capital loss carryover	5,148	552
Future deductions for purchased intangible assets	184,366	152,507
Depreciation and amortization	97,867	120,764
Pension and post-retirement benefits	206,218	220,747
Future deductions for reserves and other	91,964	155,618
Total deferred tax assets	1,967,436	2,048,621
Valuation allowance	(1,781,702)	(1,902,187)
Net deferred tax assets	185,734	146,434
Deferred tax liabilities:
Tax deductible goodwill	(18,517)	(17,120)
Purchased intangible assets	(157,331)	(130,219)
Total deferred tax liabilities	(175,848)	(147,339)
Total net deferred tax asset/(liabilities)	$ 9,886	$ (905)