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Obligations under Investment Agreements - Principal Due under Investment and Investment Repurchase Agreements, Based on Expected Optional Draw Date (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Investments [Line Items]  
Net payments due under investment agreements Principal Amount $ 362,104
2013 [Member]
  
Investments [Line Items]  
Net payments due under investment agreements Principal Amount 5,926
2014 [Member]
  
Investments [Line Items]  
Net payments due under investment agreements Principal Amount 190,000
2015 [Member]
  
Investments [Line Items]  
Net payments due under investment agreements Principal Amount 44,343
2016 [Member]
  
Investments [Line Items]  
Net payments due under investment agreements Principal Amount 4,002
2017 [Member]
  
Investments [Line Items]  
Net payments due under investment agreements Principal Amount 117,833
All later years [Member]
  
Investments [Line Items]  
Net payments due under investment agreements Principal Amount