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Loans Receivable - Loans Receivable by Internal Credit Rating (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
SecurityLoan
Dec. 31, 2015
USD ($)
SecurityLoan
Dec. 31, 2014
USD ($)
Financing Receivable, Recorded Investment [Line Items]      
Number of Loans | SecurityLoan 1 4  
Liquidation Value of Loans Receivable | $ $ 8,400    
Liquidation Value of Loans Receivable | $ $ 8,400 $ 5,280 $ 24,005
Greater than Zero [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Number of Loans | SecurityLoan 1 2  
Liquidation Value of Loans Receivable | $ $ 8,400    
Liquidation Value of Loans Receivable | $   $ 5,280  
Equal to Zero [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Number of Loans | SecurityLoan   1  
Less than Zero [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Number of Loans | SecurityLoan   1