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Stock-Based Compensation - Schedule of Information Related to Outstanding SOSARS (Detail) - Stock Only Stock Appreciation Rights (SOSARs) [Member] - $ / shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Outstanding 2,334,742 2,561,846
Exercised (441,920) (148,145)
Canceled / forfeited (446,435) (20,994)
Ending Balance, Outstanding 1,446,387 2,392,707
Beginning Balance, Weighted Average Exercise Price, Outstanding $ 18.08 $ 17.87
Weighted Average Exercise Price, Exercised 14.31 13.26
Weighted Average Exercise Price, Canceled / forfeited 21.06 18.76
Ending Balance, Weighted Average Exercise Price, Outstanding $ 19.31 $ 18.15