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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, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 211,551  
Other comprehensive income before reclassifications 311 $ 405
Amounts reclassified from accumulated other comprehensive income (loss) (103) 3
Other comprehensive income, net of taxes 208 408
Ending balance 220,178  
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (497) (419)
Ending balance (289) (11)
Unrealized gains (losses) on available-for-sale marketable securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (502) (427)
Other comprehensive income before reclassifications 147 194
Amounts reclassified from accumulated other comprehensive income (loss) 28 25
Other comprehensive income, net of taxes 175 219
Ending balance (327) (208)
Unrealized gains (losses) on cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 5 8
Other comprehensive income before reclassifications 164 211
Amounts reclassified from accumulated other comprehensive income (loss) (131) (22)
Other comprehensive income, net of taxes 33 189
Ending balance $ 38 $ 197