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Stock-Based Compensation - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Maximum
May 31, 2011
2011 Omnibus Incentive Plan
Dec. 31, 2013
Stock Option
Dec. 31, 2012
Stock Option
Dec. 31, 2011
Stock Option
Dec. 31, 2013
Restricted Stock
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Mar. 31, 2010
Stock Appreciation Rights SARS
Dec. 31, 2013
Stock Appreciation Rights SARS
Dec. 31, 2012
Stock Appreciation Rights SARS
Dec. 31, 2011
Stock Appreciation Rights SARS
Mar. 31, 2010
Performance Shares
Dec. 31, 2013
Performance Shares
Mar. 31, 2010
Cash Settled Performance Units and Stock Appreciation Rights
Dec. 31, 2012
Cash Settled Performance Units and Stock Appreciation Rights
Dec. 31, 2011
Cash Settled Performance Units and Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number         7,500,000 1,999,688 1,882,554   1,146,931 773,950                    
Stock-based compensation $ 7,480,000 $ 5,149,000 $ 3,398,000                                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 8 months 12 days                                      
Compensation costs related to stock options, nonvested restricted stock, stock appreciation rights and performance units not yet recognized 7,400,000                                      
Share based compensation arrangement by share based payment award options grants in period           361,220 487,950 410,531 521,181 404,250 377,869 326,250       434,661        
Share based compensation arrangement by share based payment award options grant date fair value           2,200,000 3,400,000 2,700,000 5,000,000 4,000,000 3,700,000                  
Share based compensation arrangement by share based payment award options grants in period weighted average grant date fair value           $ 6.13 $ 6.94 $ 6.70           $ 1.52 $ 2.68       $ 7.45 $ 7.45
Exercised, Aggregate Intrinsic Value           300,000 300,000 400,000                        
Share based compensation arrangement by share based payment award option vested in period fair value                 $ 600,000 $ 1,900,000 $ 1,900,000   $ 800,000       $ 3,000,000      
Share based compensation arrangement by share based payment award vesting period       10 years   3 years     3 years               3 years 3 years