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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax $ (419) $ (436)  
Other comprehensive income (loss) before reclassifications, net of tax 57 40  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (135) (23)  
Other comprehensive income (loss), net of taxes (78) 17 $ (355)
Ending balance, net of tax (497) (419) (436)
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 (83) (118)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 8 70  
Other comprehensive income (loss), net of taxes (75) (48)  
Ending balance, net of tax (502) (427) (379)
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 140 158  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (143) (93)  
Other comprehensive income (loss), net of taxes (3) 65  
Ending balance, net of tax $ 5 $ 8 $ (57)