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Acquisitions - Summarization of Provisional and Final Amounts on Assets Acquired and Liabilities at Fair Value (Parenthetical) (Detail) (FGL [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
FGL [Member]
 
Business Acquisition [Line Items]  
Cash acquired $ 1,040,470
Re-characterized as expense $ 5,000