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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Operating activities:    
Net income $ 2,835 $ 436
Adjustments to reconcile net income to net cash used in operating activities, net of effect of acquired business:    
Depreciation and amortization 1,511 1,477
Deferred rent (526) (99)
Deferred income taxes 53 180
Share-based compensation expenses 480 1,527
Excess tax benefits from share-based compensation (5) (37)
Accounts receivable allowances 1,743 1,775
Changes in operating assets and liabilities, exclusive of acquisitions:    
Accounts receivable 8,358 12,036
Unbilled services (3,943) (19,031)
Prepaid expenses and other assets (6,566) (556)
Accounts payable, accrued expenses, and other liabilities (11,842) (18,793)
Net cash used in operating activities (7,902) (21,085)
Investing activities:    
Consideration relating to acquisitions, net (15,731) 0
Purchase of property and equipment (1,174) (673)
Purchase of investments 0 (9,494)
Sale of investments 0 14,495
Net cash provided by (used in) investing activities (16,905) 4,328
Financing activities:    
Issuance of common stock, principally stock option exercises 119 316
Tax withholding payment reimbursed by restricted shares (194) (719)
Excess tax benefits from share-based compensation 5 37
Repurchase of common stock 0 (3,050)
Net cash used in financing activities (70) (3,416)
Effect of foreign exchange rates on cash and cash equivalents 16 148
Net decrease in cash and cash equivalents (24,861) (20,025)
Cash and cash equivalents at beginning of period 55,451 61,587
Cash and cash equivalents at end of period 30,590 41,562
Supplemental cash flow information:    
Cash paid for income taxes 1,080 4,901
Cash paid for interest $ 55 $ 56