Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Held to Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 93,409	$ 85,861
Gross Unrealized Gains	49	99
Gross Unrealized Losses	(182)	(41)
Fair Value	93,276	85,919
Corporate Bond
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	75,294	67,412
Gross Unrealized Gains	49	99
Gross Unrealized Losses	(182)	(41)
Fair Value	75,161	67,470
Perfect Home Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	18,115	18,449
Fair Value	$ 18,115	$ 18,449

For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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-Publisher AICPA

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-Number 115

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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Reference 12: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

+ References+ Details

- Definition

As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

+ References+ Details

- Definition

As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

+ References+ Details