Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Selected Quarterly Financial Data - Schedule of Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 116,334 $ 118,308 $ 109,607 $ 98,271 $ 94,025 $ 97,189 $ 105,287 $ 130,503 $ 442,520 $ 427,004 $ 712,183
Operating gross margin (loss) (4,700) 121 (11,016) (19,745) (19,694) (21,965) (20,225) (13,428) (35,340) (75,312) 29,699
Operating income (loss) (14,221) (6,815) (17,632) (27,137) (30,190) (29,576) (28,222) (23,269) (65,805) (111,257) (17,338)
Net income (loss) attributable to controlling interest (28,693) (20,311) (29,888) (39,809) (48,929) (46,228) (39,822) (95,835) (118,701) (230,814) (95,073)
Net income (loss) available to common stockholders $ (29,599) $ (21,217) $ (31,127) $ (39,809) $ (48,929) $ (46,228) $ (39,822) $ (95,835) $ (121,752) $ (230,814) $ (95,073)
Basic earnings per share - net income (loss) (in dollars per share) $ (0.21) $ (0.15) $ (0.23) $ (0.31) $ (0.39) $ (0.37) $ (0.32) $ (0.78) $ (0.89) $ (1.86) $ (0.78)
Diluted earnings per share - net income (loss) (in dollars per share) $ (0.21) $ (0.15) $ (0.23) $ (0.31) $ (0.39) $ (0.37) $ (0.32) $ (0.78) $ (0.89) $ (1.86) $ (0.78)