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Debt and Financing Arrangements - Additional Information (Detail) - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Apr. 03, 2018 | Sep. 30, 2018 | Aug. 16, 2018
Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revolving loan commitment |  |  | $ 20.0
Outstanding line of credit |  | $ 0.0 |
2018 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement amendment date | Apr. 03, 2018 |  |
Unsecured credit facility | $ 400.0 |  |
Extension of maturity date | 2023 | 2019 |
Revolving loan commitment | $ 400.0 |  |
Deferred financing costs |  | $ 1.1 |
2014 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement amendment date |  | Jul. 28, 2014 |
2014 Credit Facility [Member] | First Amendment [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement amendment date |  | Apr. 10, 2015 |
2014 Credit Facility [Member] | Second Amendment [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement amendment date |  | Nov. 03, 2015 |

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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