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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value $ 152,882 $ 152,560
Bonds A Series [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value 82,700  
Bonds B Series [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value 70,200  
Notes receivable, fair value $ 51,000