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Stock-Based Compensation - Schedule of Information Related to Outstanding SOSARS (Detail) - Stock Only Stock Appreciation Rights (SOSARs) [Member] - $ / shares
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Outstanding 1,291,947 2,334,742
Exercised (58,460) (441,920)
Canceled / forfeited (151,074) (446,435)
Ending Balance, Outstanding 1,082,413 1,446,387
Beginning Balance, Weighted Average Exercise Price, Outstanding $ 20.05 $ 18.08
Weighted Average Exercise Price, Exercised 12.85 14.31
Weighted Average Exercise Price, Canceled / forfeited 20.25 21.06
Ending Balance, Weighted Average Exercise Price, Outstanding $ 20.40 $ 19.31