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(Loss) Income Per Common Share - Basic Weighted Average Common Shares Outstanding to Diluted Weighted Average Common Shares Outstanding (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Weighted average common shares outstanding -basic 245,880 245,177 245,795 244,916
Effect of dilutive securities:        
Director and employee PSUs and RSUs 0 158 0 326
Weighted average common shares outstanding – diluted 245,880 245,335 245,795 245,242