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Share-Based Compensation - Fair Values for SARs and Stock Options Estimated on Grant Date Using Black-Scholes-Merton Option-Pricing Formula Which Incorporates Assumptions (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Weighted-average fair value of SARs and options granted $ 24.63 $ 19.53 $ 17.64
Total intrinsic value of SARs converted and options exercised $ 47,058 $ 8,898 $ 6,183
Cash received for options exercised 14,030 2,372 4,599
Tax benefit related to share-based compensation 10,734 4,119 1,790
Weighted-average fair value of restricted stock shares and units granted $ 50.38 $ 35.85 $ 35.91
Total fair value of restricted stock shares and units vested $ 9,032 $ 9,017 $ 4,370
Expected volatility 53.94% 54.26% 52.00%
Expected term (in years) 6 years 1 month 6 days 6 years 1 month 6 days 6 years 1 month 6 days
Risk-free rate 1.04% 1.11% 2.49%
Dividend yield 0.40% 0.50% 0.56%