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Stock Based Compensation - Summary of Stock Option and Stock Appreciation Rights ("SARs") Activity as well as Restricted Stock Unit ("RSUs") Activity (Detail)
3 Months Ended
Mar. 31, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding Opening 42,100,000
Granted 100,000
Cancelled/forfeited (600,000)
Exercised (1,300,000)
Number of Shares, Outstanding Closing 40,300,000
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding Opening 500,000
Vested (200,000)
Number of Shares, Outstanding Closing 300,000