Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
Operating activities:
Net income	$ 9,664	$ 7,519
Adjustments to reconcile net income to net cash provided by (used in) operating activities, net of effect of acquired businesses:
Depreciation and amortization	4,748	4,853
Loss on disposal of property and equipment	(9)
Deferred rent	(1,739)	(1,594)
Deferred income taxes	967	357
Share-based compensation expenses	4,123	2,153
Excess tax benefits from share-based compensation		(5)
Accounts receivable allowances	(2,655)	(328)
Changes in operating assets and liabilities:
Accounts receivable	8,515	(1,210)
Unbilled services	(4,037)	(8,710)
Prepaid expenses and other assets	(302)	(18,336)
Accounts payable, accrued expenses, and other liabilities	(8,541)	(1,840)
Net cash provided by (used in) operating activities	10,752	(17,141)
Investing activities:
Consideration relating to acquisitions, net	(1,537)	(15,591)
Purchase of property and equipment	(3,175)	(2,497)
Collections on notes receivable	114	14
Net cash used in investing activities	(4,598)	(18,074)
Financing activities:
Issuance of common stock, principally stock option exercises		207
Borrowings under line of credit		17,320
Repayments under line of credit		(17,320)
Payments on notes payable	(26)	(700)
Payments of debt issuance costs		(1,039)
Tax withholding payment reimbursed by restricted shares	(159)	(227)
Excess tax benefits from share-based compensation		5
Repurchase of common stock	(11,927)	(631)
Net cash used in financing activities	(12,112)	(2,385)
Effect of foreign exchange rates on cash and cash equivalents	(609)	51
Net decrease in cash and cash equivalents	(6,567)	(37,549)
Cash and cash equivalents at beginning of period	51,251	55,451
Cash and cash equivalents at end of period	44,684	17,902
Noncash investing and financing activities:
Issuance of common stock for acquired business	427
Supplemental cash flow information:
Cash paid for income taxes	12,608	1,337
Cash paid for interest	$ 287	$ 222