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Reconciliation of Unrecognized Tax Benefits (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]  
Unrecognized tax benefits at January 1, 2015 $ 2,118
Gross increases - tax positions in prior period 324
Gross decreases - settlements (1,153)
Unrecognized tax benefits at December 31, 2015 $ 1,289