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Notes Receivable - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2008
Dec. 31, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Effective interest rates on bonds (as a percent) 11.42%    
Total other-than-temporary impairment loss     $ 41,961
Impairment charges     35,418
Less portion recognized in other comprehensive income     $ 6,543
Bonds B Series [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Effective interest rates on bonds (as a percent) 11.42%   14.00%
Total other-than-temporary impairment loss     $ 42,000
Impairment charges   $ 35,400  
Less portion recognized in other comprehensive income     $ 6,500