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Revenues and Percentage of Revenues on a Geographical Basis (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended12 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Segment Reporting Information [Line Items]           
Revenues$ 160,249$ 150,679$ 152,824$ 155,931$ 155,098$ 155,329$ 143,720$ 151,496$ 619,683$ 605,643$ 630,735
Concentration of risk percentage100.00%   100.00%   100.00%100.00%100.00%
Geographic Concentration Risk
           
Segment Reporting Information [Line Items]           
Revenues        619,683605,643630,735
Geographic Concentration Risk | United States
           
Segment Reporting Information [Line Items]           
Revenues        389,676396,036430,958
Geographic Concentration Risk | United States | Sales Revenue, Services, Net
           
Segment Reporting Information [Line Items]           
Concentration of risk percentage63.00%   65.00%   63.00%65.00%68.00%
Geographic Concentration Risk | International
           
Segment Reporting Information [Line Items]           
Revenues        $ 230,007$ 209,607$ 199,777
Geographic Concentration Risk | International | Sales Revenue, Services, Net
           
Segment Reporting Information [Line Items]           
Concentration of risk percentage37.00%   35.00%   37.00%35.00%32.00%
Geographic Concentration Risk | Sales Revenue, Services, Net
           
Segment Reporting Information [Line Items]           
Concentration of risk percentage100.00%   100.00%   100.00%100.00%100.00%