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Related Party Transactions and Interests in Consolidated Entities - Schedule of Fair Value of Derivative (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Derivative [Line Items]    
Change in Unrealized Market Value $ (300) $ (300)
Level III [Member]
   
Derivative [Line Items]    
Fair value of derivative, Balance, Beginning of Period 24,127 2,126
Change in Unrealized Market Value 284 284
Fees Received 23,705 45,706
Fair value of derivative, Balance, End of Period $ 48,116 $ 48,116