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Loans Payable - Outstanding Principal Amounts of Term Loan Payable (Detail) (Senior Credit Facility [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Senior Credit Facility [Member]
Debt Instrument [Line Items]
2014	$ 75.0
2015	175.0
2016	250.0
Total outstanding principal amounts	$ 500.0

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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