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Stock-Based Compensation Classification of Stock-Based Compensation Expense Narrative (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
vesting_type
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of award vesting types 3    
Weighted-average grant date fair value of options issued $ 6.83 $ 7.45 $ 8.28
Total intrinsic value of options exercised $ 3.9 $ 1.2 $ 0.9
Market-based awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 8 years    
Options vested 0 0 110,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures and Expirations 554,000 6,000 125,000
Stock-based compensation expense 0.2 0.4 1.2
Stock-based compensation, maximum number of unvested shares 402,000    
Performance-based awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures and Expirations 398,000 6,000 108,000
Stock-based compensation expense 0 0.2 0.3
Options issued 41,000 180,000 193,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 0 14,000 56,000
Performance based maximum number of unvested shares 452,000    
Total unrecognized compensation cost related to non-vested stock options granted 2.3    
Total unrecognized compensation cost, weighted-average period for recognition 1 year 10 months 24 days    
Service-based awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options canceled or forfeited 14,000 1,000 60,000
Stock-based compensation expense 0.5 0.7 0.8
Options issued 43,000 113,000 121,000
Vesting period 4 years    
Expiration term 8 years    
Service Based Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost related to non-vested stock options granted 0.7    
Total unrecognized compensation cost, weighted-average period for recognition 2 years 8 months 12 days    
Performance-based stock units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options issued 83,000 90,000 61,000
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options issued 28,000 30,000 20,000
Vesting period 3 years    
Percentage of shares vesting on the first anniversary of grant 25.00%    
Percentage of shares vesting after the first anniversary of grant 75.00%    
Restricted Stock [Member] | Non-employees [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense   0.1  
Granted to restricted shares to members of its advisory boards 8,000 5,000 0
Deferred stock units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred stock units issued to directors 48,000 25,000 28,000
Percentage of shares vested in lieu of directors fees at the grant date 100.00%    
Portion of Director fees matched to deferred stock units 25.00%    
Vesting period of deferred stock 1 year    
Deferred stock units, performance-based stock units and restricted stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 1.1 0.7 0.7
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 67,000 53,000  
Granted to restricted shares to members of its advisory boards 167,000 151,000  
Share based compensation arrangement by share based payment award equity instruments other than options issued in period 3.3    
Total fair value of stock-based compensation vested $ 1.1 $ 0.9 $ 2.0