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Stockholders' Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Maximum
Jul. 11, 2012
Dividend Declared
Jun. 30, 2012
April 17, 2012
Shareholders Equity [Line Items]          
Dividend declared per share       $ 0.19  
Dividend declared date       Jul. 11, 2012  
Dividends payment date       Aug. 24, 2012  
Dividends payable record date       Jul. 27, 2012  
Options granted 7,895,000       1,235,000
Option exercise (strike) price per share         $ 54.00
Closing stock price per share on date of grant         $ 49.01
Options vesting and exercisable     8 years    
Options termination period after the end of the relevant vesting period (in months) 13 months        
Total stock-based compensation expense $ 2,100 $ 1,800      
Total unrecognized compensation expense $ 22,852        
Weighted average period over which total unrecognized compensation expense will be recognized (in years) 5 years 29 days