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Investments with Continuous Unrealized Losses and Related Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Investments With Continuous Unrealized Losses For Less Than 12 Months, Fair Value	$ 19,995
Investments With Continuous Unrealized Losses For Less Than 12 Months, Unrealized Losses	(4)
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Investments With Continuous Unrealized Losses For Less Than 12 Months, Fair Value	19,995
Investments With Continuous Unrealized Losses For Less Than 12 Months, Unrealized Losses	$ (4)

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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