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Notes Receivable - Additional Information (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Note
Mar. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income $ 3,143 $ 3,008
National Bonds [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of notes receivable | Note 2  
Interest income $ 3,100 3,000
Payment received relating to notes receivables $ 3,300 $ 3,400