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Notes Receivable - Summary of Activity in Loan Loss Reserve (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Receivables [Abstract]      
Beginning Balance $ 15,106 $ 10,806 $ 10,806
Additions:      
Loan loss reserve 0 4,300 5,000
Deductions:      
Write downs 0 0 (5,000)
Ending Balance $ 15,106 $ 15,106 $ 10,806