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Equity-Based Compensation - Weighted-Average Assumptions Used for Grants of Stock Options and SARs (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Expected dividend yield 0.00% 0.00% 0.00%
Forfeiture rate 10.21% 11.50% 9.78%
Risk free interest rate, minimum 0.07% 0.01% 0.06%
Risk free interest rate, maximum 1.95% 3.18% 3.41%
Expected weighted-average life 5 years 5 months 23 days 5 years 5 months 1 day 5 years 4 months 10 days
Fair value of options and SARs granted $ 5,533,000 $ 5,495,000 $ 6,527,000
Weighted-average grant date fair value of options and SARs granted (per underlying share) $ 12.84 $ 14.29 $ 10.64
Stock Option And Stock Appreciation Rights (SARs) [Member]
     
Volatility 35.90% 35.33% 39.50%
Risk free interest rate 0.94% 2.01% 2.26%