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Net Income Per Share - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Net Income Per Share [Line Items]        
Anti-dilutive shares 0 0 0 0
2.25% Convertible Senior Notes Due 2019 [Member]
       
Net Income Per Share [Line Items]        
Debt instrument, interest rate 2.25%   2.25%  
Debt instrument, maturity year     2019