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Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Loss | $ 2,919,913 | $ 2,879,656
Unrealized gain on qualifying cash flow hedging instruments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Loss | 6,007 | 1,409
Pension adjustments, net of tax recoveries |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Loss | (2,426) | (10,697)
Foreign exchange gain on currency translation |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Loss | 4,138 | 3,293
AOCI Including Portion Attributable to Noncontrolling Interest |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Loss | $ 7,719 | $ (5,995)

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