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Acquisitions - Company's Pro forma Results (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Sep. 30, 2012 FGL [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Non-recurring bargain purchase gain	$ 7,264	$ 158,341

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Business combination bargain purchase gain recognized amount.

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