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Stock-Based Compensation - Summary of Activity for Outstanding and Exercisable Stock Appreciation Rights (Detail)
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock appreciation rights outstanding | shares 746,184
Stock appreciation rights exercisable | shares 506,436
Weighted Average Base Value, Stock appreciation rights outstanding | $ / shares $ 27.87
Weighted Average Base Value, Stock appreciation rights exercisable | $ / shares $ 26.57
Weighted Average Remaining Contractual Life, Stock appreciation rights outstanding 4 years 3 months 18 days
Weighted Average Remaining Contractual Life, Stock appreciation rights exercisable 3 years 8 months 12 days
Aggregate Intrinsic Value, Stock appreciation rights outstanding | $ $ 11,334
Aggregate Intrinsic Value, Stock appreciation rights exercisable | $ $ 8,349