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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value $ 150,517 $ 152,560
Bonds A Series [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value $ 81,100  
Maturity date Jul. 01, 2034  
Bonds B Series [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value $ 69,400  
Notes receivable, fair value $ 62,000  
Maturity date Sep. 01, 2037