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Financial Instruments - Summary of Effects of Interest Rate Swaps (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Derivatives, Fair Value [Line Items] |  |
(Loss) Gain Recognized in AOCL, Net of Tax | $ (427) | $ 450
Interest Rate Swap [Member] | Interest Expense [Member] |  |
Derivatives, Fair Value [Line Items] |  |
(Loss) Gain Recognized in AOCL, Net of Tax | (427) | 450
Loss Reclassified from AOCL into Expense | $ (139) | $ (38)

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- Definition Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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