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Valuation and Qualifying Accounts (Detail) (Allowance for Doubtful Accounts, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Allowance for Doubtful Accounts
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
BALANCE AT BEGINNING OF YEAR $ 1,004 $ 966 $ 1,121
AMOUNTS CHARGED (CREDITED) TO COSTS AND EXPENSES 993 89 678
DEDUCTIONS (251) [1] (51) [1] (833) [1]
BALANCE AT END OF YEAR $ 1,746 $ 1,004 $ 966
[1] accounts written off, net of recoveries.