ACQUISITIONS (Narrative) (Details) $ in Thousands									12 Months Ended
	Nov. 16, 2015 USD ($)	Jul. 10, 2015 USD ($)	Jun. 30, 2015 shares	Mar. 31, 2015 shares	Oct. 31, 2014 USD ($) shares	Jun. 06, 2014 USD ($) shares	Apr. 30, 2014 USD ($) Owner shares	Mar. 05, 2014 USD ($) shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) shares
Minimum
Business Acquisition [Line Items]
Estimated future operating results period, subsequent to acquisition date									7 months
Maximum
Business Acquisition [Line Items]
Estimated future operating results period, subsequent to acquisition date									12 months
Netsoft
Business Acquisition [Line Items]
Increase (decrease) in assets acquired | $									$ (348)
GGA
Business Acquisition [Line Items]
Increase (decrease) in assets acquired | $									1,366
Great Fridays
Business Acquisition [Line Items]
Increase (decrease) in assets acquired | $									$ (77)
2015 Acquisitions | NavigationArts
Business Acquisition [Line Items]
Cash consideration placed in escrow | $		$ 2,670
Consideration placed in escrow, period		18 months
2015 Acquisitions | NavigationArts | Design Consultant
Business Acquisition [Line Items]
Numbers of professionals acquired		90
2015 Acquisitions | AGS
Business Acquisition [Line Items]
Cash consideration placed in escrow | $	$ 5,000
Consideration placed in escrow, period	15 months
2015 Acquisitions | AGS | IT professionals
Business Acquisition [Line Items]
Numbers of professionals acquired	1,151
2014 Acquisition | Netsoft
Business Acquisition [Line Items]
Cash consideration placed in escrow | $								$ 256
Consideration placed in escrow, period								18 months
2014 Acquisition | Netsoft | IT professionals
Business Acquisition [Line Items]
Numbers of professionals acquired								40
2014 Acquisition | Jointech
Business Acquisition [Line Items]
Consideration placed in escrow, percentage							15.00%
Number of former owners | Owner							2
2014 Acquisition | Jointech | IT professionals
Business Acquisition [Line Items]
Numbers of professionals acquired							216
2014 Acquisition | GGA | IT professionals
Business Acquisition [Line Items]
Numbers of professionals acquired						329
2014 Acquisition | GGA | Scientists
Business Acquisition [Line Items]
Numbers of professionals acquired						126
2014 Acquisition | Great Fridays | Designers
Business Acquisition [Line Items]
Numbers of professionals acquired					50
2014 Acquisition | Employment Shares | Netsoft
Business Acquisition [Line Items]
Share vesting term (in years)								3 years	3 years
Stock issued or issuable, value assigned | $								$ 1,017
2014 Acquisition | Employment Shares | Jointech
Business Acquisition [Line Items]
Consideration placed in escrow, period							18 months
Share vesting term (in years)							3 years		3 years
Stock issued or issuable, value assigned | $							$ 7,788
2014 Acquisition | Employment Shares | GGA
Business Acquisition [Line Items]
Share vesting term (in years)						3 years			3 years
Stock issued or issuable, value assigned | $						$ 20,655
2014 Acquisition | Employment Shares | Great Fridays
Business Acquisition [Line Items]
Consideration placed in escrow, period					24 months
Share vesting term (in years)					3 years				3 years
Shares placed in escrow					28,390
Stock issued or issuable, value assigned | $					$ 4,823
2014 Acquisition | Employment Shares, Closing Shares | Netsoft
Business Acquisition [Line Items]
Common Shares, Issued (in shares)								2,289
2014 Acquisition | Employment Shares, Closing Shares | Jointech
Business Acquisition [Line Items]
Common Shares, Issued (in shares)							89,552
2014 Acquisition | Employment Shares, Closing Shares | GGA
Business Acquisition [Line Items]
Consideration placed in escrow, period						15 months
Common Shares, Issued (in shares)						262,277
Shares placed in escrow						102,631
2014 Acquisition | Employment Shares, Closing Shares | Great Fridays
Business Acquisition [Line Items]
Common Shares, Issued (in shares)					90,864
2014 Acquisition | Employment Shares, Earn-Out Shares | Netsoft
Business Acquisition [Line Items]
Common Shares, Issued (in shares)				16,349
Common Shares, Deferred (in shares)								9,154
2014 Acquisition | Employment Shares, Earn-Out Shares | Jointech
Business Acquisition [Line Items]
Common Shares, Issued (in shares)			83,057
2014 Acquisition | Employment Shares, Earn-Out Shares | GGA
Business Acquisition [Line Items]
Common Shares, Issued (in shares)			233,753
2014 Acquisition | Employment Shares, Earn-Out Shares | Great Fridays | Maximum
Business Acquisition [Line Items]
Common Shares, Issued (in shares)			10,092
2014 Acquisition | Common Stock
Business Acquisition [Line Items]
Common Shares, Issued (in shares)										0
Common Shares, Deferred (in shares)										89,552
Stock issued or issuable, value assigned | $										$ 0
2014 Acquisition | Common Stock | Netsoft
Business Acquisition [Line Items]
Common Shares, Issued (in shares)								0
Common Shares, Deferred (in shares)								0
Stock issued or issuable, value assigned | $								$ 0
2014 Acquisition | Common Stock | Jointech
Business Acquisition [Line Items]
Common Shares, Issued (in shares)							0
Common Shares, Deferred (in shares)							89,552
Stock issued or issuable, value assigned | $							$ 0
2014 Acquisition | Common Stock | GGA
Business Acquisition [Line Items]
Common Shares, Issued (in shares)						0
Common Shares, Deferred (in shares)						0
Stock issued or issuable, value assigned | $						$ 0
2014 Acquisition | Common Stock | Great Fridays
Business Acquisition [Line Items]
Common Shares, Issued (in shares)					0
Common Shares, Deferred (in shares)					0
Stock issued or issuable, value assigned | $					$ 0