Fair Value of Financial Assets and Liabilities - Changes In Fair Value of Level 3 Financial Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Auction rate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of the period	$ 74,596	$ 146,044
Calls at par value	(6,625)	(73,050)
Other-than-temporary impairment loss	(2,824)	0
(Increase) decrease in previously recognized unrealized losses included in other comprehensive income	4,939	1,602
Balance, end of the period	70,086	74,596
LenovoEMC
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of the period	0	0
Purchase of investment	32,745	0
Balance, end of the period	$ 32,745	$ 0

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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