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Beginning Balance, Annual Activity and Ending Balance of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ (3,541) $ (1,970)
Other comprehensive gain (loss) 85 (248)
Ending Balance $ (3,456) $ (2,218)