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Company's derivative financial instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Derivative Liability |  |  | $ 0
Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Derivative, Notional Amount | $ 2,000,000 | $ 2,000,000 |
Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Derivative Liability |  |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Derivative, Notional Amount | 2,000,000 |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Derivative Liability |  |  |

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + 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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