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Derivatives - Additional Information (Detail) | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
May 31, 2016 USD ($) | May 31, 2016 GBP (£) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | May 31, 2016 GBP (£)
Derivative [Line Items] |  |  |  |  |
Cross currency swap assets |  |  | $ 73,000,000.0 | $ 60,500,000 |
Cross Currency Swap Assets [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 650,000,000.0 |  |  |  | £ 449,300,000
Cross currency swap agreement cash flow due to interest payment | $ 35,800,000 | £ 24,700,000 |  |  |
Derivative exchange rate | 1.45 |  |  |  | 1.45

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- Definition Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + 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 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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- Details
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