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Changes in Accumulated Balances of Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 211,551
Other comprehensive income (loss) before reclassifications	$ 48	$ 105	359	$ 510
Amounts reclassified from accumulated other comprehensive income (loss)	(37)	(100)	(140)	(97)
Other comprehensive income, net of taxes	11	5	219	413
Ending balance	229,653		229,653
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(289)	(11)	(497)	(419)
Ending balance	(278)	(6)	(278)	(6)
Unrealized gains (losses) on available-for-sale marketable securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(327)	(208)	(502)	(427)
Other comprehensive income (loss) before reclassifications	48	188	195	382
Amounts reclassified from accumulated other comprehensive income (loss)	1	(12)	29	13
Other comprehensive income, net of taxes	49	176	224	395
Ending balance	(278)	(32)	(278)	(32)
Unrealized gains (losses) on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	38	197	5	8
Other comprehensive income (loss) before reclassifications		(83)	164	128
Amounts reclassified from accumulated other comprehensive income (loss)	(38)	(88)	(169)	(110)
Other comprehensive income, net of taxes	$ (38)	(171)	$ (5)	18
Ending balance		$ 26		$ 26

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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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