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Senior and Subordinated Debt - Debt Maturities Relating to Senior Borrowings Outstanding (Detail) (Senior Borrowings Outstanding [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Senior Borrowings Outstanding [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
2013-2014
2015	528,500
2016
2017	548,350
Total	$ 1,076,850

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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