Acquisitions (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014 Aggregate Year to Date Acquisitions	Dec. 31, 2013 Aggregate Year to Date Acquisitions	Mar. 31, 2014 Aggregate Year to Date Acquisitions Luntz Global Partners L L C	Mar. 31, 2014 Aggregate Year to Date Acquisitions Kingsdale Partners LP	Dec. 31, 2013 Aggregate Year to Date Acquisitions Local Biz Now LLC
Business Acquisition [Line Items]
business acquisition, current period revenue	$ 10,480		$ 16,141
business acquisition, current period net income	3,456		4,085
Business Acquisition, Increase (Decrease) In Contingent Purchase Price Obligation	4,071	2,387	12,093	4,683
Business Acquisition, Cost of Acquired Entity, Purchase Price					100,574	38,202
Business Acquisition, Cost of Acquired Entity, Cash Paid					43,315	12,000
Business Acquisition, Deferred Acquisition Consideration					57,259	26,202
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets					24,374	10,835
Business Acquisition, Purchase Price Allocation, Goodwill Amount					135,651	35,956
Nonredeemable Noncontrolling Interest					61,517
Redeemable Noncontrolling Interest, Equity, Carrying Amount						11,090
Business Acquisition Purchase Price Allocation Intangibles and Goodwill Expected Tax Deductible Amount					$ 101,290	$ 46,791
Noncontrolling Interest, Ownership Percentage by Parent	100.00%		100.00%
Business Acquisition, Percentage of Voting Interests Acquired							60.00%	65.00%	70.00%