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Investments and Related Party Transactions - Summary of Maximum Exposure to Loss Associated with RS Cogen (Detail) - RS Cogen [Member] - Not a Primary Beneficiary [Member] - Chlorovinyls [Member] - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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Investment Holdings [Line Items] |  |
Investment in and net advances to RS Cogen | $ 9,500,000 | $ 4,600,000
Supply contracts | 36,300,000 | 38,500,000
Maximum exposure to loss | $ 45,800,000 | $ 43,100,000

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