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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share for Continuing Operations (Parenthetical) (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock Compensation Plan [Member]          
Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]          
Share based awards excluded from the calculation of diluted earnings per share 500,000   400,000 500,000 700,000
Performance Shares [Member]          
Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]          
Share based awards excluded from the calculation of diluted earnings per share   173,000      
Exercised / Vested, Number of Shares 0     0