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Convertible Senior Notes - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
Apr. 02, 2012
Jan. 02, 2012
Nov. 30, 2009
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jul. 02, 2012
Subsequent Event
Nov. 30, 2009
Scenario, Forecast
Debt Instrument [Line Items]                  
Long term debt, face amount     $ 100.0            
Debt instrument, interest rate     4.50%            
Frequency of interest payment     Semi-annually            
Debt instrument, maturity date     Nov. 01, 2014            
Conversion rate in share per $1000 principal amount of notes     63.2091           66.9978
Debt instrument, conversion rate     $ 15.82           $ 14.93
Cash dividend on common stock     $ 0.10            
Dividend payment date Apr. 02, 2012 Jan. 02, 2012 Oct. 03, 2011         Jul. 02, 2012  
Principal amount of notes allocated to equity component     13.7            
Interest expenses associated with amortization of equity component       $ 0.7 $ 0.7 $ 1.4 $ 1.4