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Discontinued Operations - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Discontinued Operations [Line Items]
Proceeds from sale of wholly owned subsidiary		$ 21,000,000	$ 343,000,000
Pretax loss			(38,000,000)
After tax loss	$ 0	$ (455,000)	$ (35,013,000)

Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.