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Derivatives - Additional Information (Detail) | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2019 USD ($) | Aug. 31, 2019 GBP (£) | Sep. 30, 2019 USD ($) | Aug. 31, 2019 GBP (£) | Dec. 31, 2018 USD ($) | May 31, 2016 USD ($) | May 31, 2016 GBP (£)
Derivative [Line Items] |  |  |  |  |  |  |
Cross currency swap liabilities |  |  | $ (15,900,000) |  |  |  |
Cross currency swap assets |  |  |  |  | $ 60,500,000 |  |
Cross Currency Swap Assets [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount | $ 650,000,000.0 |  |  | £ 538,100,000 |  | $ 650,000,000.0 | £ 449,300,000
Terminated cross currency swap derivatives | 105,000,000.0 |  |  |  |  |  |
Cross currency swap agreement cash flow due to interest payment | $ 35,800,000 | £ 25,400,000 |  |  |  |  |

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- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + Details
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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References No definition available. + Details
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