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Debt - Debt Summary (Parenthetical) (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt | $ 10,706,139 | $ 11,089,815
GBP |  |
Debt Instrument [Line Items] |  |
Debt | $ 676,732 | $ 635,972
Percentage of outstanding debt | 6.30% | 5.80%
CAD |  |
Debt Instrument [Line Items] |  |
Debt | $ 271,975 | $ 266,337
Percentage of outstanding debt | 2.50% | 2.40%
EUR |  |
Debt Instrument [Line Items] |  |
Debt | $ 4,803,307 | $ 4,893,693
Percentage of outstanding debt | 44.90% | 44.10%
JPY |  |
Debt Instrument [Line Items] |  |
Debt | $ 2,182,119 | $ 1,951,844
Percentage of outstanding debt | 20.40% | 17.60%
USD |  |
Debt Instrument [Line Items] |  |
Debt | $ 2,772,006 | $ 3,341,969
Percentage of outstanding debt | 25.90% | 30.10%

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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