CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income including noncontrolling interests	$ 28,599us-gaap_ProfitLoss	$ 28,556us-gaap_ProfitLoss	$ 11,849us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities-
Amortization of identifiable intangible assets	7,653us-gaap_AmortizationOfIntangibleAssets	7,132us-gaap_AmortizationOfIntangibleAssets	8,837us-gaap_AmortizationOfIntangibleAssets
Depreciation expense	13,683us-gaap_Depreciation	11,440us-gaap_Depreciation	11,793us-gaap_Depreciation
Goodwill impairment	727us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Bad debt expense	1,275us-gaap_ProvisionForDoubtfulAccounts	19us-gaap_ProvisionForDoubtfulAccounts	2,453us-gaap_ProvisionForDoubtfulAccounts
Deferred tax expense (benefit)	(4,579)us-gaap_DeferredIncomeTaxExpenseBenefit	4,514us-gaap_DeferredIncomeTaxExpenseBenefit	3,541us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of debt financing costs	283us-gaap_AmortizationOfFinancingCosts	245us-gaap_AmortizationOfFinancingCosts	229us-gaap_AmortizationOfFinancingCosts
Gain on sale of assets	(830)	(589)	(607)
Changes in the fair value of contingent earn-out obligations	245	(1,646)	(662)
Stock-based compensation expense	4,806us-gaap_ShareBasedCompensation	3,974us-gaap_ShareBasedCompensation	2,797us-gaap_ShareBasedCompensation
(Increase) decrease in-
Receivables, net	(18,339)	(12,427)	2,913
Inventories	281us-gaap_IncreaseDecreaseInInventories	1,208us-gaap_IncreaseDecreaseInInventories	1,195us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	1,494	(109)	370
Costs and estimated earnings in excess of billings	2,744	(1,918)	1,636
Other noncurrent assets	(321)	(491)	(3,334)
Increase (decrease) in-
Accounts payable and accrued liabilities	(4,078)	6,776	(15,507)
Billings in excess of costs and estimated earnings	7,545	(9,226)	1,776
Other long-term liabilities	1,364	965	1,231
Net cash provided by (used in) operating activities	42,552	38,423	30,510
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(19,183)	(17,403)	(11,782)
Proceeds from sales of property and equipment	1,355	1,107	1,106
Proceeds from businesses sold		43	164
Cash paid for acquisitions, earn-outs and intangible assets, net of cash acquired	(56,314)		(12,656)
Net cash used in investing activities	(74,142)	(16,253)	(23,168)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit	128,500	43,000	62,000
Payment on revolving line of credit	(90,000)	(43,000)	(62,000)
Payments on other long-term debt	(2,000)us-gaap_RepaymentsOfLongTermDebt	(5,400)us-gaap_RepaymentsOfLongTermDebt	(7,349)us-gaap_RepaymentsOfLongTermDebt
Payments on capital lease obligations	(115)
Debt financing costs	(568)us-gaap_PaymentsOfFinancingCosts	(552)us-gaap_PaymentsOfFinancingCosts
Payments of dividends to shareholders	(8,444)us-gaap_PaymentsOfDividendsCommonStock	(7,875)us-gaap_PaymentsOfDividendsCommonStock	(7,498)us-gaap_PaymentsOfDividendsCommonStock
Share repurchase program	(7,974)	(1,832)	(2,860)
Shares received in lieu of tax withholding	(531)	(631)	(544)
Excess tax benefit of stock-based compensation	115	534	100
Proceeds from exercise of options	1,229	4,883	329
Distributions to noncontrolling interests	(8,612)us-gaap_PaymentsToMinorityShareholders
Net cash provided by (used in) financing activities	11,600	(10,873)	(17,822)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(19,990)	11,297	(10,480)
CASH AND CASH EQUIVALENTS, beginning of period-continuing operations and discontinued operations	52,054	40,757	51,237
CASH AND CASH EQUIVALENTS, end of period-continuing operations and discontinued operations	$ 32,064	$ 52,054	$ 40,757

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- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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