Annual report pursuant to Section 13 and 15(d)

Summary of Unrecognized Tax Benefits (Detail)

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Summary of Unrecognized Tax Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits [Line Items]  
Beginning balance $ 1,066
Additions for tax positions related to the prior year 160
Lapse of statute of limitations   
Ending balance $ 1,226