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Equity And Cash Incentive Program - Summary of Outstanding and Exercisable SARs (Detail) - Stock Appreciation Rights [Member] - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 387,071 454,683
Weighted Average Remaining Life in Years 6 years 8 months 12 days  
Aggregate Intrinsic Value, Outstanding $ 13,089  
Number of Shares, Exercisable 157,078  
Weighted Average Exercise Price $ 64.3  
Weighted Average Remaining Life in Years 4 years 7 months 6 days  
Aggregate Intrinsic Value, Exercisable $ 5,763  
Range of Exercise Price $25.96 - $37.79 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 23,816  
Weighted Average Exercise Price $ 37.79  
Weighted Average Remaining Life in Years 2 years 1 month 6 days  
Aggregate Intrinsic Value, Outstanding $ 1,505  
Number of Shares, Exercisable 23,816  
Weighted Average Exercise Price $ 37.79  
Weighted Average Remaining Life in Years 2 years 1 month 6 days  
Aggregate Intrinsic Value, Exercisable $ 1,505  
Range of Exercise Price $40.54 - $58.69 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 125,469  
Weighted Average Exercise Price $ 57.52  
Weighted Average Remaining Life in Years 6 years 8 months 12 days  
Aggregate Intrinsic Value, Outstanding $ 5,454  
Number of Shares, Exercisable 38,309  
Weighted Average Exercise Price $ 58.14  
Weighted Average Remaining Life in Years 3 years 7 months 6 days  
Aggregate Intrinsic Value, Exercisable $ 1,642  
Range of Exercise Price $63.33 - $82.51 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 237,786  
Weighted Average Exercise Price $ 75.21  
Weighted Average Remaining Life in Years 7 years 2 months 12 days  
Aggregate Intrinsic Value, Outstanding $ 6,130  
Number of Shares, Exercisable 94,953  
Weighted Average Exercise Price $ 73.44  
Weighted Average Remaining Life in Years 5 years 8 months 12 days  
Aggregate Intrinsic Value, Exercisable $ 2,616