v3.5.0.2

New Developments and Basis of Presentation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2016 | Jun. 10, 2016
Basis Of Presentation [Line Items] |  |  |  |
Net proceeds from sale | $ 29.2 |  |  |
Westlake Chemical Corporation and Lagoon Merger Sub, Inc. [Member] |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Merger agreement date |  |  | Jun. 10, 2016 |
Merger consideration per share |  |  |  | $ 33.00
Termination fee |  |  | $ 77.7 |
Merger-related expenses |  | $ 8.4 | $ 13.6 |

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