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Assumptions Used to Estimate Fair Value of SARs Granted to Employees (Detail) (Stock Appreciation Rights (SARs))
3 Months Ended
Mar. 31, 2014
Employee
Mar. 31, 2013
Employee
Stock Appreciation Rights (SARs)
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield 0.00% 0.00%
Expected volatility, Minimum 37.00% 45.00%
Expected volatility, Maximum 52.00% 54.00%
Risk-free interest rate, Minimum 0.10% 0.10%
Risk-free interest rate, Maximum 2.20% 1.40%
Expected forfeiture 10.00% 10.00%
Contractual term of up to 7 years 7 years
Suboptimal exercise multiple 2.1 2.1