Acquisitions (Details) - Preliminary Allocation of Purchase Price (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Assets:
Goodwill	$ 586,665		$ 519,203	$ 519,506	[1]
Software Advice
Assets:
Cash	1,450
Fees receivable and other current assets	3,606
Property, equipment, and leasehold improvements	235
Amortizable intangible assets	26,928	[2]
Goodwill	73,663	[3]
Total assets	105,882
Liabilities:
Accounts payable and accrued liabilities	2,657
Total liabilities	2,657
Net assets acquired	103,225	[4]
Other Acquisitions
Assets:
Cash	3,203	[5]
Fees receivable and other current assets	3,694	[5]
Property, equipment, and leasehold improvements	170	[5]
Amortizable intangible assets	5,047	[2],[5]
Goodwill	4,710	[3],[5]
Total assets	16,824	[5]
Liabilities:
Accounts payable and accrued liabilities	4,484	[5]
Total liabilities	4,484	[5]
Net assets acquired	12,340	[4],[5]
Total
Assets:
Cash	4,653
Fees receivable and other current assets	7,300
Property, equipment, and leasehold improvements	405
Amortizable intangible assets	31,975	[2]
Goodwill	78,373	[3],[4]
Total assets	122,706
Liabilities:
Accounts payable and accrued liabilities	7,141
Total liabilities	7,141
Net assets acquired	$ 115,565	[4]

[1] The Company does not have an accumulated goodwill impairment loss.

[2] See Note 1 - Business and Significant Accounting Policies for additional information regarding the types and amounts of amortizable intangibles recorded from the 2014 Acquisitions.

[3] During 2014, and subsequent to the 2014 Acquisitions, the Company recorded certain working capital, tax, and other minor adjustments which decreased the recorded goodwill resulting from the Market-Visio and SircleIT Inc. acquisitions by approximately $0.1 million and $0.2 million, respectively. In addition, the recorded amount of an amortizable intangible asset resulting from the Software Advice acquisition was reduced by $2.7 million and goodwill was increased by the same amount due to a change in the underlying assumptions used to value the amortizable intangible asset based on the consideration of additional information that became available.

[4] The Company paid $114.6 million in cash on a gross basis for the net assets acquired through December 31, 2014. On a net basis, and for cash flow reporting, the Company paid $109.9 million in cash through December 31, 2014, which represents the $114.6 million in cash paid on a gross basis minus the $4.7 million of cash acquired from the purchased companies.

[5] Includes the SircleIT Inc. and Market-Visio acquisitions.