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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, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Outstanding 2,561,846 2,736,616
Exercised (158,545) (33,050)
Canceled / forfeited (51,285) (17,630)
Ending Balance, Outstanding 2,352,016 2,685,936
Beginning Balance, Weighted Average Exercise Price, Outstanding $ 17.87 $ 17.64
Weighted Average Exercise Price, Exercised 13.31 14.65
Weighted Average Exercise Price, Canceled / forfeited 22.35 18.46
Ending Balance, Weighted Average Exercise Price, Outstanding $ 18.08 $ 17.67