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Stock-Based Compensation - Schedule of Information Related to Outstanding SOSARS (Detail) - Stock Only Stock Appreciation Rights (SOSARs) [Member] - $ / shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Outstanding 2,334,742 2,561,846
Exercised (283,060) (138,423)
Canceled / forfeited (258,439) (20,994)
Ending Balance, Outstanding 1,793,243 2,402,429
Beginning Balance, Weighted Average Exercise Price, Outstanding $ 18.08 $ 17.87
Weighted Average Exercise Price, Exercised 13.95 12.98
Weighted Average Exercise Price, Canceled / forfeited 20.82 18.76
Ending Balance, Weighted Average Exercise Price, Outstanding $ 18.96 $ 18.14