Changes in Accumulated Balances of Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (367)		$ 360
Other comprehensive income (loss) before reclassifications	435		138
Amounts reclassified from accumulated other comprehensive income (loss)	(189)		(619)
Net current period other comprehensive income (loss)	246	604	(481)	1,181
Ending balance	(121)		(121)
Unrealized gains (losses) on available-for-sale marketable securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(704)		224
Other comprehensive income (loss) before reclassifications	518		(171)
Amounts reclassified from accumulated other comprehensive income (loss)	(62)		(301)
Net current period other comprehensive income (loss)	456		(472)
Ending balance	(248)		(248)
Unrealized gains (losses) on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	146		216
Other comprehensive income (loss) before reclassifications	77		295
Amounts reclassified from accumulated other comprehensive income (loss)	(164)		(452)
Net current period other comprehensive income (loss)	(87)		(157)
Ending balance	59		59
Estimated tax (expense) benefit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	191		(80)
Other comprehensive income (loss) before reclassifications	(160)		14
Amounts reclassified from accumulated other comprehensive income (loss)	37		134
Net current period other comprehensive income (loss)	(123)		148
Ending balance	$ 68		$ 68

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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