XML 57 R47.htm IDEA: XBRL DOCUMENT v3.7.0.1
Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value $ 155,535 $ 152,882
Bonds A Series [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value $ 82,700  
Maturity date Jul. 01, 2034  
Bonds B Series [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value $ 72,800  
Notes receivable, fair value $ 54,000  
Maturity date Sep. 01, 2037