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Information Pertaining to Held to Maturity Securities with Gross Unrealized Losses (Detail) (Corporate Bonds, USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Corporate Bonds
Schedule of Held-to-maturity Securities [Line Items]
Fair Value	$ 49,185	$ 72,315
Gross Unrealized Losses	$ (150)	$ (664)

- Definition

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity.

+ References+ Details

- Definition

This item represents the fair value of securities categorized as held-to-maturity which are in an unrealized loss position.

+ References+ Details