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Stock-Based Compensation Plans - Additional Information (Detail)
12 Months Ended
Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Vesting period 3 years
Expiration term of stock options 5 years
2005 Equity Based Compensation Plan
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of shares issued under the plans 5,600,000
Maximum number of common stock authorized to be issued under the Plans 15,000,000
1999 Stock Option Plan
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of shares issued under the plans 2,200,000
Maximum number of common stock authorized to be issued under the Plans 7,200,000
Director Plan
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Maximum number of common stock authorized to be issued under the Plans 450,000