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Notes Receivable - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest income | $ 2,766 | $ 2,969 | $ 5,519 | $ 5,917 |
National Bonds [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest income | $ 2,700 | $ 2,900 | 5,300 | 5,900 |
Payment received relating to notes receivables |  |  | $ 3,100 | $ 3,200 |
Bonds A Series [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity date of notes receivable |  |  |  |  | Jul. 01, 2034
Bonds B Series [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity date of notes receivable |  |  |  |  | Sep. 01, 2037

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