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Impairment Losses on Other-Than-Temporary Impairments Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Impairment loss recognized in earnings	$ 63	$ 77	$ 115
Asset backed securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Impairment loss recognized in earnings	$ 63	$ 77	$ 115

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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