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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of SARs and options granted $ 19.53 $ 17.64 $ 10.47
Total intrinsic value of SARs converted and options exercised $ 2,452 $ 3,801 $ 2,947
Cash received for options exercised 2,372 4,599 3,158
Tax benefit (deficiency) related to share-based compensation 4,119 1,790 (110)
Weighted-average fair value of restricted stock shares and units granted $ 35.85 $ 35.91 $ 22.34
Total fair value of restricted stock shares and units vested $ 9,017 $ 4,370 $ 7,611
Expected volatility 54.26% 52.00% 50.89%
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 1.11% 2.49% 2.89%
Dividend yield 0.50% 0.56% 0.91%