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Changes in Accumulated Balances of Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax $ (419) $ (436)
Other comprehensive income (loss) before reclassifications, net of tax 405 47
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 3 78
Other comprehensive income, net of taxes 408 125
Ending balance, net of tax (11) (311)
Unrealized gains (losses) on available-for-sale marketable securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax (427) (379)
Other comprehensive income (loss) before reclassifications, net of tax 194 145
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 25 13
Other comprehensive income, net of taxes 219 158
Ending balance, net of tax (208) (221)
Unrealized gains (losses) on cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax 8 (57)
Other comprehensive income (loss) before reclassifications, net of tax 211 (98)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (22) 65
Other comprehensive income, net of taxes 189 (33)
Ending balance, net of tax $ 197 $ (90)