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Changes in Accumulated Balances of Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax $ (139) $ (64) $ (436) $ (81)
Other comprehensive income (loss) before reclassifications, net of tax (162) (328) 95 (279)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (24) 53 16 21
Other comprehensive income (loss), net of taxes (186) (275) 111 (258)
Ending balance, net of tax (325) (339) (325) (339)
Unrealized gains (losses) on available-for-sale marketable securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (327) (82) (379) (65)
Other comprehensive income (loss) before reclassifications, net of tax (39) (79) (26) (85)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 28   67 (11)
Other comprehensive income (loss), net of taxes (11) (79) 41 (96)
Ending balance, net of tax (338) (161) (338) (161)
Unrealized gains (losses) on cash flow hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax 188 18 (57) (16)
Other comprehensive income (loss) before reclassifications, net of tax (123) (249) 121 (194)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (52) 53 (51) 32
Other comprehensive income (loss), net of taxes (175) (196) 70 (162)
Ending balance, net of tax $ 13 $ (178) $ 13 $ (178)