v2.4.0.6
Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable    
Billed and billable $ 141,422 $ 179,179
Less: unpaid deferred revenue (60,304) (78,339)
Accounts receivable, gross 81,118 100,840
Less: allowance for doubtful accounts (5,644) (6,117)
Accounts receivable, net $ 75,474 $ 94,723