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Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Detail) - 6 months ended Jun. 30, 2018 $ in Thousands, € in Millions | USD ($) interest_rate_swaps | EUR (€) interest_rate_swaps
--- | --- | ---
U.S. Dollar-denominated interest rate swaps | LIBOR |  |
Derivative [Line Items] |  |
Principal Amount | $ 1,256,827 |
Fair value / carrying amount of asset / (liability) | $ (14,623) |
Weighted-average remaining term (years) | 4 years 1 month 6 days |
Fixed interest rate | 2.90% | 2.90%
Euro-denominated interest rate swaps |  |
Derivative [Line Items] |  |
Principal Amount | € |  | € 186.2
Reduced principal amount of interest rate swaps | $ 81,900 | € 70.1
Euro-denominated interest rate swaps | EURIBOR |  |
Derivative [Line Items] |  |
Principal Amount | 217,621 |
Fair value / carrying amount of asset / (liability) | $ (26,107) |
Weighted-average remaining term (years) | 2 years 6 months |
Fixed interest rate | 3.10% | 3.10%
Interest rate swap agreements |  |
Derivative [Line Items] |  |
Fair value / carrying amount of asset / (liability) | $ (40,730) |
Derivative, number of instruments held | interest_rate_swaps | 2 | 2
Minimum | Interest rate swap agreements |  |
Derivative [Line Items] |  |
Debt instrument, basis spread on variable rate | 0.30% |
Maximum | Interest rate swap agreements |  |
Derivative [Line Items] |  |
Debt instrument, basis spread on variable rate | 4.00% |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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