XML 83 R73.htm IDEA: XBRL DOCUMENT 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