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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 244,670
Other comprehensive income (loss) before reclassifications	$ 46	$ 79	(958)	$ 438
Amounts reclassified from accumulated other comprehensive income (loss)	87	(2)	260	(142)
Other comprehensive income (loss), net of taxes	133	77	(698)	296
Ending balance	244,388		244,388
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,417)	(278)	(586)	(497)
Ending balance	(1,284)	(201)	(1,284)	(201)
Unrealized gains (losses) on available-for-sale marketable securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,342)	(278)	(586)	(502)
Other comprehensive income (loss) before reclassifications	28	82	(726)	277
Amounts reclassified from accumulated other comprehensive income (loss)	30	(5)	28	24
Other comprehensive income (loss), net of taxes	58	77	(698)	301
Ending balance	(1,284)	(201)	(1,284)	(201)
Unrealized gains (losses) on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(75)			5
Other comprehensive income (loss) before reclassifications	18	(3)	(232)	161
Amounts reclassified from accumulated other comprehensive income (loss)	57	$ 3	$ 232	(166)
Other comprehensive income (loss), net of taxes	$ 75			$ (5)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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