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Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Loss | $ 3,913,783 | $ 4,089,293
Unrealized loss on qualifying cash flow hedging instruments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Loss | (493) | (41)
Pension adjustments, net of tax recoveries |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Loss | (12,272) | (12,160)
Unrealized gain (loss) on marketable securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Loss | 284 | (416)
Foreign exchange gain on currency translation |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Loss | 2,426 | 2,014
AOCI Including Portion Attributable to Noncontrolling Interest |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Loss | $ (10,055) | $ (10,603)

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