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Borrowings - Terms of MetLife Facility (Detail) - MetLife Credit Facility | 12 Months Ended
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Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |
Aggregate Commitment | $ 200,000,000
Principal Outstanding | 164,008,000
Long-term debt, additional amount available | $ 22,900,000
Minimum annualized rate (as percent) | 2.50%
Minimum |
Debt Instrument [Line Items] |
Commitment fee (as percent) | 0.10%
Unused fee (as percent) | 0.10%
Maximum |
Debt Instrument [Line Items] |
Commitment fee (as percent) | 0.20%
Unused fee (as percent) | 0.20%
Notes payable to bank |
Debt Instrument [Line Items] |
Aggregate Commitment | $ 200,000,000
Weighted-average interest rate (as percent) | 3.42%
Principal Outstanding | $ 163,908,000
Undrawn Commitment | 21,530,000
Notes payable to bank | Lease One |
Debt Instrument [Line Items] |
Aggregate Commitment | $ 16,500,000
Term of debt | 28 years 6 months 26 days
Weighted-average interest rate (as percent) | 3.70%
Notes payable to bank | Lease Two |
Debt Instrument [Line Items] |
Aggregate Commitment | $ 25,500,000
Term of debt | 28 years 6 months 26 days
Weighted-average interest rate (as percent) | 3.81%
Line of credit |
Debt Instrument [Line Items] |
Aggregate Commitment | $ 75,000,000
Principal Outstanding | 100,000
Undrawn Commitment | $ 74,900,000
Line of credit | LIBOR |
Debt Instrument [Line Items] |
Basis spread (as percent) | 2.00%

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