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Short-Term Borrowing - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 08, 2015 USD ($)
Short-term Debt [Line Items] |  |  |  |
Short-term borrowings | $ 294,458,000 | $ 250,969,000 |  |
Line of Credit Facility, Aggregate Borrowing Capacity | $ 370,000,000 |  |  |
Number Of Unsecured Bank Credit Facilities | 5 |  |  |
Number Of Financial Institutions With Bank Credit Facilities | 4 |  |  |
Line Of Available Credit Facility Borrowing Capacity | $ 220,000,000 |  |  |
ParticipatingLendersInTheRevolver | 5 |  |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 3.4379% | 2.4246% |  |
Line of Credit Facility, Commitment Fee Amount | $ 93,300 | $ 131,000 | $ 145,000 |
Ratio of Indebtedness to Net Capital | 0.65 |  |  |
Uncommitted Line Of Credit Facility One [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | $ 150,000,000
Revolving Credit Facility [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Aggregate Borrowing Capacity | $ 350,000,000 |  |  |
Committed Line of Credit Facility Two [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR rate, plus 1.00 percent |  |  |
Line of Credit Facility, Aggregate Borrowing Capacity | $ 30,000,000 |  |  |
Short-term Revolving Line of Credit Facility [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Debt Instrument, Description of Variable Rate Basis | Lender's base rate plus 80 basis points |  |  |
Line of Credit Facility, Aggregate Borrowing Capacity | $ 50,000,000 |  |  |
Committed Line of Credit Facility Three [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Debt Instrument, Description of Variable Rate Basis | Lender's base rate, plus 0.85 percent |  |  |
Line of Credit Facility, Aggregate Borrowing Capacity | $ 45,000,000 |  |  |
Unsecured Debt [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Expiration Date | Oct. 31, 2019 |  |  |
Revolving Credit Facility [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Expiration Date | Oct. 08, 2020 |  |  |

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- Definition Line Of Credit Facility Maximum Borrowing Committed Capacity + References No definition available. + Details
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- Definition Number Of Financial Institutions With Bank Credit Facilities + References No definition available. + Details
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- Definition Number Of Unsecured Bank Credit Facilities + References No definition available. + Details
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- Definition Participating Lenders In The Revolver + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Amount of the fee for available but unused credit capacity under the credit facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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