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International Business Machines Corporation Alliance Agreement - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended
Sep. 21, 2012
Mar. 17, 2008
Sep. 30, 2012
Sep. 30, 2012
Sep. 21, 2012
Revolving Credit Facility
Feb. 10, 2012
Revolving Credit Facility
Sep. 30, 2012
Warrant One
Mar. 17, 2008
Warrant One
Mar. 17, 2008
Warrant One
Maximum
Sep. 30, 2012
Warrant Two
Mar. 17, 2008
Warrant Two
Mar. 17, 2008
Warrant Two
Maximum
Sep. 21, 2012
Stock Repurchase Plan 1
Sep. 21, 2012
Stock Repurchase Plan 2
Alliance Agreement [Line Items]                            
Description of alliance agreement amendment   On March 17, 2008, the Company and IBM entered into Amendment No. 1 to the Alliance ("Amendment No.1" and included hereafter in all references to the "Alliance"), which changed the timing of certain payments to be made by IBM.                        
Isssuance of warrants to IBM to purchase common stock                 1,427,035     1,427,035    
Common stock warrant exercise price             27.50 27.50   33.00 33.00   27.50 33.00
Common stock warrants,exercise date   5 years                        
Common stock warrants exercised             11,470     350,000        
Proceeds from exercises of common stock warrants     $ 11,866,000 $ 11,866,000                    
Common stock warrants repurchased 2,492,600                       1,415,565 1,077,035
Cash settlement of common stock warrants 4,600,000     29,596,000                    
Additional amount used to fund share repurchase program         $ 24,000,000 $ 95,000,000