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Schedule IV - Mortgage Loans on Real Estate - Summary of Changes in Carrying Amounts of Mortgage Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Movement in Mortgage Loans on Real Estate [Roll Forward]    
Balance at beginning of year $ 389,167 $ 258,092
New mortgage loans 401,912 159,465
Collections of principal (137,168) (31,408)
Discount accretion 4,672 3,018
Balance at the close of year $ 658,583 [1] $ 389,167
[1] The aggregate cost for federal income tax purposes is $658,583.