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Convertible Senior Notes - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
Nov. 30, 2009
Jun. 30, 2013
Apr. 01, 2013
4.50% Convertible senior notes (due 2014)
Jan. 03, 2012
4.50% Convertible senior notes (due 2014)
Nov. 30, 2009
4.50% Convertible senior notes (due 2014)
Jun. 30, 2013
4.50% Convertible senior notes (due 2014)
Jun. 30, 2012
4.50% Convertible senior notes (due 2014)
Jun. 30, 2013
4.50% Convertible senior notes (due 2014)
Jun. 30, 2012
4.50% Convertible senior notes (due 2014)
Dec. 31, 2012
4.50% Convertible senior notes (due 2014)
Jul. 01, 2013
4.50% Convertible senior notes (due 2014)
Subsequent Event
Jul. 24, 2013
4.50% Convertible senior notes (due 2014)
Subsequent Event
Nov. 30, 2009
4.50% Convertible senior notes (due 2014)
Scenario, Forecast
Debt Instrument [Line Items]                          
Long term debt, face amount         $ 100.0                
Debt instrument, interest rate         4.50%             4.50%  
Frequency of interest payment         Semi-annually                
Debt instrument, maturity date   Apr. 02, 2013     Nov. 01, 2014     Nov. 01, 2014          
Conversion rate in share per $1000 principal amount of notes         63.2091               68.8564
Debt instrument, conversion rate         $ 15.82               $ 14.52
Cash dividend on common stock per share paid     $ 0.07 $ 0.10             $ 0.07    
Debt discount 13.7                        
Interest expenses associated with amortization of equity component           0.7 0.7 1.4 1.4        
Debt instrument unamortized discount           3.7   3.7   5.1      
Long term debt, Fair Value           $ 102.2   $ 102.2   $ 107.9