v3.4.0.3

Investments - Additional Information (Detail) |  | 3 Months Ended |
--- | --- | --- | ---
Jun. 17, 2015 USD ($) | Mar. 31, 2016 USD ($) MW | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Eagle US 2 LLC [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amount of capital committed in LACC | $ 225,000,000 |  |  |
Percentage of interest in LACC | 10.00% |  |  |
Other Assets [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment in LACC |  | $ 24,400,000 |  | $ 14,900,000
Maximum [Member] | Eagle US 2 LLC [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of ownership | 50.00% |  |  |
TCI [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Ownership interest (as a percent) |  | 60.00% |  |
RS Cogen [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Ownership interest (as a percent) |  | 50.00% |  |
Production capacity of combined cycle natural gas-fired cogeneration facility in Lake Charles, Louisiana (in megawatt) | MW |  | 425 |  |
RS Cogen [Member] | Chlorovinyls [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Future commitment per year to purchase electricity and steam from the joint venture |  | $ 23,500,000 |  |
Aggregate future commitment to purchase electricity and steam from the joint venture |  | 154,100,000 |  |
Purchases under future commitment |  | $ 6,600,000 | $ 6,500,000 |

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