Schedule of Components of Deferred Tax Assets Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 36,674	$ 37,899
Tax credits	64,123	76,248
Inventory valuations	50,886	42,760
Pension liability	28,674	21,119
Research and development	284	10,028
Accruals	14,246	13,817
Equity compensation	9,355	8,729
Vacation accrual	6,452	6,267
Other	282	398
Deferred revenue	15,118	35,869
Gross deferred tax assets	226,094	253,134
Less: valuation allowance	(55,446)	(51,066)
Total deferred tax assets	170,648	202,068
Marketable securities	(996)	(827)
Intangible assets	(114,730)	(144,925)
Excess of tax over book depreciation	(22,446)	(18,417)
Total deferred tax liabilities	(138,172)	(164,169)
Net deferred assets	$ 32,476	$ 37,899