Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net earnings	$ 5,392	$ 2,816	$ 3,253
Adjustments to reconcile earnings from operations to net cash provided by operating activities:
Depreciation and amortization	14,308	10,392	9,034
Amortization of debt discount, premium and deferred loan costs	183	188	1,539
Stock-based compensation expense	6,321	5,093	3,980
Loss on disposals of property, plant and equipment, net	31	6	15
Foreign currency transaction (gains) losses on short-term intercompany balances	(377)	417	422
Deferred income taxes	(799)	(2,151)	(1,354)
Changes in operating assets and liabilities, net of business acquisitions:
Restricted cash	(1)		193
Billed receivables	(1,598)	1,717	(1,757)
Unbilled receivables	(2,179)	(5,419)	(320)
Prepaid expenses and other current assets	693	(718)	(1,400)
Other assets	(179)	(455)	56
Accounts payable and accrued expenses	(1,125)	110	(2,529)
Accrued payroll and related expenses	(1,258)	8,289	(6,255)
Refund liabilities	392	(837)	(39)
Deferred revenue	(157)	(338)	(139)
Noncurrent compensation obligations	345	432	(707)
Other long-term liabilities	(1,149)	(249)	(523)
Net cash provided by operating activities	18,843	19,293	3,469
Cash flows from investing activities:
Business acquisitions, net of cash acquired	(1,542)	(3,155)	(7,741)
Purchases of property and equipment, net of disposal proceeds	(7,931)	(8,287)	(6,934)
Net cash used in investing activities	(9,473)	(11,442)	(14,675)
Cash flows from financing activities:
Repayments of former credit facility (Note 5)			(14,070)
Repayments of long-term debt and capital lease obligations	(3,000)	(3,000)	(3,260)
Proceeds from term loan (Note 5)			15,000
Payments for deferred loan costs		(6)	(666)
Payments of deferred acquisition consideration	(2,837)	(1,694)	(409)
Net proceeds from issuance of common stock	14,682
Restricted stock remitted by employees for taxes	(1,605)	(1,063)	(214)
Proceeds from stock option exercises	559	353	109
Net cash provided by (used in) financing activities	7,799	(5,410)	(3,510)
Effect of exchange rates on cash and cash equivalents	300	(552)	138
Net change in cash and cash equivalents	17,469	1,889	(14,578)
Cash and cash equivalents at beginning of year	20,337	18,448	33,026
Cash and cash equivalents at end of year	37,806	20,337	18,448
Supplemental cash flow statement information:
Cash paid during the year for interest	340	422	570
Cash paid during the year for income taxes, net of refunds received	2,730	4,235	2,743
Deferred and contingent business acquisition consideration (Note 12)	$ 189	$ 5,643	$ 1,638