Summary of Accumulated Other Comprehensive Loss, Net of Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (2,920)		$ (1,825)
Other comprehensive loss before reclassifications	(9,280)		(10,499)
Amounts reclassified from AOCI	122		246
Net comprehensive loss	(9,158)	3,189	(10,253)	3,622
Ending Balance	(12,078)		(12,078)
Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,181)		(283)
Other comprehensive loss before reclassifications	(9,207)		(10,178)
Amounts reclassified from AOCI	71		144
Net comprehensive loss	(9,136)		(10,034)
Ending Balance	(10,317)		(10,317)
Defined Benefit Pension Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,739)		(1,542)
Other comprehensive loss before reclassifications	(73)		(321)
Amounts reclassified from AOCI	51		102
Net comprehensive loss	(22)		(219)
Ending Balance	$ (1,761)		$ (1,761)

- 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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