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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Operating activities:    
Net income $ 4,186 $ 1,209
Adjustments to reconcile net income to net cash used in operating activities, net of effect of acquired businesses:    
Depreciation and amortization 3,201 2,821
Loss on disposal of property and equipment 0 1,160
Deferred rent (1,193) (1,920)
Deferred income taxes 309 266
Share-based compensation expenses 1,321 2,479
Excess tax benefits from share-based compensation (5) (38)
Accounts receivable allowances (64) 5,622
Changes in operating assets and liabilities:    
Accounts receivable 17,474 8,051
Unbilled services (8,160) (16,948)
Prepaid expenses and other assets (26,488) (2,847)
Accounts payable, accrued expenses, and other liabilities (17,321) (26,862)
Net cash used in operating activities (26,740) (27,007)
Investing activities:    
Consideration paid for acquisitions, net (15,591) 0
Purchase of property and equipment (1,971) (1,504)
Purchase of investments 0 (9,494)
Sale of investments 0 18,994
Collections on notes receivable 14 14
Net cash provided by (used in) investing activities (17,548) 8,010
Financing activities:    
Issuance of common stock, principally stock option exercises 207 575
Borrowings under line of credit 17,320 0
Repayments under line of credit (12,177) 0
Tax withholding payments reimbursed by restricted shares (214) (732)
Excess tax benefits from share-based compensation 5 38
Repurchase of common stock 0 (5,620)
Net cash provided by (used in) financing activities 5,141 (5,739)
Effect of foreign exchange rates on cash and cash equivalents 29 (63)
Net decrease in cash and cash equivalents (39,118) (24,799)
Cash and cash equivalents at beginning of period 55,451 61,587
Cash and cash equivalents at end of period 16,333 36,788
Supplemental cash flow information:    
Cash paid for income taxes 1,287 8,686
Cash paid for interest $ 137 $ 111