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Supplemental Cash Flow Information - Schedule Of Noncash Investing and Financing Activities (Detail) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract] |  |
Accrued liabilities for purchases of property, plant and equipment | $ 20,771 | $ 34,714
Acquisition of assets through capital lease | $ 449 | $ 149

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