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Borrowings - Terms of MetLife Facility (Detail) - MetLife Credit Facility - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Aggregate Commitment |  | $ 200,000,000
Principal Outstanding |  | 126,758,000
Long-term debt, additional amount available |  | $ 18,100,000
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
Principal Outstanding |  | $ 126,658,000
Weighted-average interest rate (as percent) |  | 3.30%
Term of debt |  | 9 years
Undrawn Commitment |  | $ 63,530,000
Line of credit |  |
Debt Instrument [Line Items] |  |
Aggregate Commitment |  | 75,000,000
Principal Outstanding |  | 100,000
Undrawn Commitment |  | $ 74,900,000
Interest rate (as percent) |  | 4.66%
Line of credit | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread (as percent) |  | 2.25%

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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