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Stockholders' Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Apr. 30, 2013
Feb. 28, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Apr. 30, 2013
Minimum [Member]
Apr. 30, 2013
Maximum [Member]
Jul. 31, 2013
Subsequent Event [Member]
Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2010
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2009
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
RSU's issued 389,000     389,000   389,000   301,000         71,000 63,000 95,496
Performance of RSU's Vesting                         100% or 40% on April 1, 2014 100% or 40% on April 1, 2013 100% or 40% on April 1, 2012
Performance of Outstanding RSU's                             40.00%
Compensation expense Estimate vesting                         100.00% 100.00% 100.00%
Modified Estimate vesting of RSU's                       0.00%   0.00% 40.00%
Dividend declared and paid per share           $ 0.30 $ 0.28                
Aggregate dividend declared for the year           $ 6.4 $ 6.4                
Dividend declared       $ 0.15 $ 0.14 $ 0.30 $ 0.28       $ 0.15        
Aggregate cost of repurchase of common stock           302.9                  
Authorized to Purchase of common stock under the stock repurchase program     50.0     385.0         25.0        
Cumulative repurchase of common stock 11,700,000     11,700,000   11,700,000                  
Repurchase of self-tender   130                          
Common stock price per share                 $ 32.00 $ 36.00          
Increment in per share value   $ 0.25                          
Purchase of common stock   2,054,732                          
Purchase price of common stock   $ 36.00                          
Aggregate price of stock   74.0                          
Expenses related to tender offer   1.1                          
Treasury stock, retired 11,700,000                            
Carrying value of retired stock $ 302.5