XML 127 R110.htm IDEA: XBRL DOCUMENT v3.7.0.1
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 ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Weighted-average fair value of SARs and options granted (in usd per share) $ 18.79 $ 31.22 $ 35.46
Total intrinsic value of SARs converted and options exercised $ 9,678 $ 14,697 $ 24,023
Cash received for options exercised 0 30 48
Tax benefit related to share-based compensation $ 1,171 $ 5,050 $ 6,859
Weighted-average fair value of restricted stock shares and units granted (in usd per share) $ 54.52 $ 96.52 $ 72.46
Total fair value of restricted stock shares and units vested $ 8,171 $ 7,696 $ 7,888
Expected volatility (as a percent) 37.47% 35.66% 52.63%
Expected term (in years) 5 years 8 months 12 days 5 years 8 months 12 days 5 years 9 months 18 days
Risk-free rate (as a percent) 1.32% 1.59% 1.79%
Dividend yield (as a percent) 0.38% 0.22% 0.28%