Business Acquisitions and Divestitures (Textual) (Details) - USD ($)	1 Months Ended								6 Months Ended	12 Months Ended					37 Months Ended	38 Months Ended	71 Months Ended
	Dec. 31, 2015	Aug. 31, 2015	Oct. 31, 2014	Aug. 31, 2014	Feb. 28, 2014	Dec. 31, 2011	Nov. 30, 2010	Feb. 28, 2010	Jun. 30, 2012	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Nov. 30, 2012	Jan. 31, 2012
Significant Acquisitions and Disposals [Line Items]
Payments for business acquisition										$ 520,000	$ 0	$ 0
Value of shares issued in business acquisition											1,279,000	1,472,000
Goodwill, reduction due to fair value adjustment											(596,000)
Goodwill	$ 11,810,000									11,810,000	13,036,000	13,686,000			$ 13,036,000	$ 13,686,000	$ 11,810,000
Business Strategy, Inc. Assets [Member]
Significant Acquisitions and Disposals [Line Items]
Loss on sale of divested assets (less than)		$ 1,600,000
Business Strategy, Inc. Assets [Member] | Minimum [Member]
Significant Acquisitions and Disposals [Line Items]
Revenue sharing percentage		10.00%
Business Strategy, Inc. Assets [Member] | Maximum [Member]
Significant Acquisitions and Disposals [Line Items]
Revenue sharing percentage		30.00%
Adjacent Services [Member] | Chicago, Illinois [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from sale of divested assets			$ 1,100,000
Loss on sale of divested assets (less than)			100,000
Contingent consideration which may be received, earn-out payments			$ 800,000
Etesius Limited [Member]
Significant Acquisitions and Disposals [Line Items]
Payments for business acquisition								$ 3,100,000
Payment of contingent consideration				$ 200,000	$ 700,000												1,400,000
Etesius Limited [Member] | Initial payment [Member]
Significant Acquisitions and Disposals [Line Items]
Payments for business acquisition								2,800,000
Etesius Limited [Member] | Obligations [Member]
Significant Acquisitions and Disposals [Line Items]
Payments for business acquisition								300,000
Etesius Limited [Member] | Deferred Payments [Member]
Significant Acquisitions and Disposals [Line Items]
Contingent consideration, liability								$ 1,200,000
Contingent consideration, payment term								4 years
Etesius Limited [Member] | Potential Additional Variable Payments (Earn Out) [Member]
Significant Acquisitions and Disposals [Line Items]
Contingent consideration, payment term								4 years
Contingent consideration, liability, maximum								$ 3,800,000
TJG Holdings LLC [Member] | Initial payment [Member]
Significant Acquisitions and Disposals [Line Items]
Payments for business acquisition							$ 2,300,000
Contingent consideration, liability							1,400,000					$ 0				0
Contingent consideration, liability, maximum							$ 1,900,000
Payment of contingent consideration																1,900,000
Earn-out period for contingent consideration							2 years
Total estimated purchase price							$ 3,700,000
Increase in contingent consideration liability																$ (500,000)
CRC Management Consultants LLP [Member]
Significant Acquisitions and Disposals [Line Items]
Total estimated purchase price																			$ 1,000,000
QFS Limited [Member]
Significant Acquisitions and Disposals [Line Items]
Total estimated purchase price									$ 400,000
Nordic Profit Provider AB [Member]
Significant Acquisitions and Disposals [Line Items]
Total estimated purchase price																		$ 100,000
Business Strategy, Inc. [Member]
Significant Acquisitions and Disposals [Line Items]
Contingent consideration, liability											$ 0				0
Payment of contingent consideration															6,300,000
Total estimated purchase price						$ 11,900,000								$ 11,900,000
Increase in contingent consideration liability						4,900,000									(1,400,000)
Revenue of acquiree recognized since acquisition date													$ 10,900,000	800,000
Earnings of acquiree recognized since acquisition date													1,500,000	100,000
Business combination, adjustment to initial fair value accounting													12,200,000
Goodwill, reduction due to fair value adjustment													$ (200,000)
Business combination, decrease in fair value of purchase price														(200,000)
Goodwill						7,577,000								7,577,000
Goodwill, deductible for income tax purposes						1,500,000								1,500,000
Payment of contingent consideration, cash															$ 3,600,000
Payment of contingent consideration, common stock (in shares)															404,775
Payment of contingent consideration, common stock, amount															$ 2,700,000
Purchase price						11,919,000
Business Strategy, Inc. [Member] | Initial payment [Member]
Significant Acquisitions and Disposals [Line Items]
Payments for business acquisition						$ 2,800,000
Shares issued in business acquisition (in shares)						640,614
Value of shares issued in business acquisition						$ 3,700,000
Business Strategy, Inc. [Member] | Additional payment [Member]
Significant Acquisitions and Disposals [Line Items]
Payments for business acquisition									$ 700,000
Business Strategy, Inc. [Member] | Performance Requirement [Member]
Significant Acquisitions and Disposals [Line Items]
Contingent consideration, payment term						2 years
Contingent consideration, liability, maximum						$ 5,500,000								5,500,000
Business Strategy, Inc. [Member] | Audit Claim Recovery [Member]
Significant Acquisitions and Disposals [Line Items]
Contingent consideration, payment term						2 years
Contingent consideration, liability, maximum						$ 8,000,000.0								$ 8,000,000.0
Supplier Information Management [Member]
Significant Acquisitions and Disposals [Line Items]
Purchase price	700,000
Supplier Information Management [Member] | Initial payment [Member]
Significant Acquisitions and Disposals [Line Items]
Payments for business acquisition	$ 500,000
Supplier Information Management [Member] | Performance Requirement [Member]
Significant Acquisitions and Disposals [Line Items]
Contingent consideration, payment term	2 years
Contingent consideration, liability, maximum	$ 200,000									$ 200,000							$ 200,000