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Investment in Laramie Energy - Summarized Financial Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
ASSETS                      
Current assets $ 603,544       $ 403,108       $ 603,544 $ 403,108  
Current liabilities 470,952       382,765       470,952 382,765  
Income (loss) from operations 21,602 $ 26,716 $ 16,451 $ 29,189 28,325 $ (21,784) $ (3,313) $ (19,719) 93,958 (16,494) $ 61,514
Net income (loss) 19,005 $ 18,824 $ 7,006 $ 27,786 13,687 $ (27,761) $ (13,088) $ (18,673) 72,621 (45,835) (39,911)
Laramie Energy Company                      
ASSETS                      
Current assets 18,757       12,199       18,757 12,199  
Non-current assets 720,444       655,022       720,444 655,022  
Current liabilities 42,149       58,067       42,149 58,067  
Non-current liabilities $ 237,497       $ 186,631       237,497 186,631  
Natural gas and oil revenues                 157,879 104,826 42,870
Income (loss) from operations                 6,019 (27,325) (40,984)
Net income (loss)                 $ 30,837 $ (61,849) $ (49,159)