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Deferred Income Tax Assets (Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Tax credit carryforwards | $ 77,396 | $ 59,372
Research and development expenses | 187,477 | 181,449
Loss carryforwards | 124,201 | 131,989
Allowances and reserves | 202,141 | 229,056
Deferred compensation | 111,850 | 118,878
Postretirement benefits | 37,479 | 72,912
Other | 66,599 | 67,942
Gross deferred income tax assets | 807,143 | 861,598
Intangible assets | (282,737) | (279,592)
Other | (5,555) | (8,262)
Gross deferred income tax liabilities | (288,292) | (287,854)
Deferred income tax asset valuation allowances | (64,641) | (67,705)
Net deferred income tax assets | $ 454,210 | $ 506,039

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