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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2017
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities | $ 230,100 | $ 205,200 |
3.25% note, due April 30, 2032 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities | $ 70,000 | $ 70,000 |
Notes Payable, Other Payables [Member] | Shelf Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.25% |  |
Prudential [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | $ 150,000 |  |
Prudential [Member] | Notes Payable, Other Payables [Member] | Shelf Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | 150,000 |  |
MetLife [Member] | Notes Payable, Other Payables [Member] | Shelf Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | $ 150,000 |  |
Maturity date term | 20 years |  |
New York Life [Member] | Notes Payable, Other Payables [Member] | Shelf Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | $ 100,000 |  |
Maturity date term | 20 years |  |
Prudential and Metlife [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | $ 230,000 |  |
Series A [Member] | New York Life [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes |  |  | $ 50,000
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.48%
Series B [Member] | New York Life [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.58%

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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