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Earnings (Loss) Per Share - Schedule of Weighted-Average Number of Shares Outstanding (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]      
Basic weighted average common shares outstanding (in shares) 234,986 183,615 130,186
Dilution effect of stock awards at end of period (in shares) 2,889 0 0
Diluted weighted average common shares outstanding (in shares) 237,875 183,615 130,186