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Changes in Accumulated Balances of Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax $ (11) $ (311) $ (419) $ (436)
Other comprehensive income before reclassifications, net of tax 105 210 510 257
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (100) (38) (97) 40
Other comprehensive income, net of taxes 5 172 413 297
Ending balance, net of tax (6) (139) (6) (139)
Unrealized gains (losses) on available-for-sale marketable securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (208) (221) (427) (379)
Other comprehensive income before reclassifications, net of tax 188 (132) 382 13
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (12) 26 13 39
Other comprehensive income, net of taxes 176 (106) 395 52
Ending balance, net of tax (32) (327) (32) (327)
Unrealized gains (losses) on cash flow hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax 197 (90) 8 (57)
Other comprehensive income before reclassifications, net of tax (83) 342 128 244
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (88) (64) (110) 1
Other comprehensive income, net of taxes (171) 278 18 245
Ending balance, net of tax $ 26 $ 188 $ 26 $ 188