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Income (Loss) 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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Weighted Average Number Of Shares Outstanding [Abstract]        
Weighted average common shares outstanding -basic 247,770 245,880 247,773 245,795
Effect of dilutive securities:        
Director and employee restricted stock and performance based equity awards 666   1,269  
Weighted average common shares outstanding – diluted 248,436 245,880 249,042 245,795