Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data - Schedule of Selected Quarterly Financial Data (Detail)

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Selected Quarterly Financial Data - Schedule of Selected Quarterly Financial Data (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 148,748,000 $ 173,418,000 $ 185,941,000 $ 204,076,000 $ 243,213,000 $ 242,012,000 $ 254,234,000 $ 229,225,000 $ 712,183,000 $ 968,684,000 $ 874,172,000
Operating gross margin (3,460,000) 4,871,000 4,021,000 24,267,000 36,768,000 45,066,000 43,485,000 28,863,000 29,699,000 154,182,000 168,447,000
Operating income (20,718,000) (4,547,000) (7,944,000) 15,871,000 27,714,000 35,239,000 37,497,000 19,770,000 (17,338,000) 120,220,000 101,872,000
Net income (loss) attributable to controlling interest $ (35,646,000) $ (48,620,000) $ (14,029,000) $ 3,222,000 $ 7,753,000 $ 12,566,000 $ 15,681,000 $ (12,549,000) $ (95,073,000) $ 23,451,000 $ 27,015,000
Basic earnings per share - net income (loss) $ (0.29) $ (0.40) $ (0.11) $ 0.03 $ 0.06 $ 0.10 $ 0.13 $ (0.10) $ (0.78) $ 0.19 $ 0.23
Diluted earnings per share - net income (loss) $ (0.29) $ (0.40) $ (0.11) $ 0.03 $ 0.06 $ 0.10 $ 0.13 $ (0.10) $ (0.78) $ 0.19 $ 0.22