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Fair Value Hierarchy for Financial Assets Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds $ 9,237 [1] $ 39,283 [1]
Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds $ 9,237 [1] $ 39,283 [1]
[1] Included in "Cash and cash equivalents" in the consolidated balance sheets as of December 31, 2011 and 2010 in addition to $20.6 million and $20.3 million, respectively, of cash. Unrealized gains and losses on money market funds were nominal due to the short-term nature of the investments.