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Changes in Accumulated Balances of Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax $ (436) $ (81)  
Other comprehensive income (loss) before reclassifications, net of tax 40 (698)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (23) 343  
Other comprehensive income (loss), net of taxes 17 (355) $ (441)
Ending balance, net of tax (419) (436) (81)
Unrealized gains (losses) on available-for-sale marketable securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax (379) (65)  
Other comprehensive income (loss) before reclassifications, net of tax (118) (311)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 70 (3)  
Other comprehensive income (loss), net of taxes (48) (314)  
Ending balance, net of tax (427) (379) (65)
Unrealized gains (losses) on cash flow hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax (57) (16)  
Other comprehensive income (loss) before reclassifications, net of tax 158 (387)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (93) 346  
Other comprehensive income (loss), net of taxes 65 (41)  
Ending balance, net of tax $ 8 $ (57) $ (16)