Business and Basis of Presentation (Detail) - Preliminary Allocation of Purchase Price) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Assets:
Goodwill	$ 598,731		$ 519,203	[1]
Software Advice, Inc.
Assets:
Cash	1,450
Fees receivable and other current assets	3,612
Property, equipment, and leasehold improvements	235
Amortizable intangible assets	26,928	[2],[3]
Goodwill	73,663	[3]
Total assets	105,888
Liabilities:
Accounts payable and accrued liabilities	2,663
Total liabilities	2,663
Net assets acquired	103,225	[4]
Other Acquisitions
Assets:
Cash	3,202
Fees receivable and other current assets	3,645
Property, equipment, and leasehold improvements	170
Amortizable intangible assets	5,073	[2],[3]
Goodwill	5,012	[3]
Total assets	17,102
Liabilities:
Accounts payable and accrued liabilities	4,746
Total liabilities	4,746
Net assets acquired	12,356	[4]
Total
Assets:
Cash	4,652
Fees receivable and other current assets	7,257
Property, equipment, and leasehold improvements	405
Amortizable intangible assets	32,001	[2],[3]
Goodwill	78,675	[3]
Total assets	122,990
Liabilities:
Accounts payable and accrued liabilities	7,409
Total liabilities	7,409
Net assets acquired	$ 115,581	[4]

[1] The Company does not have any accumulated goodwill impairment losses.

[2] See Note 6 - Goodwill and Intangible Assets for additional information regarding the types and amounts of amortizable intangibles recorded from these acquisitions.

[3] During the three months ended June 30, 2014, the recorded amount of an amortizable intangible asset resulting from the Software Advice acquisition was reduced by approximately $2.7 million and goodwill was increased by the same amount. This measurement period adjustment was based on a change in the underlying assumptions used to value the amortizable intangible asset and was due to the consideration of new information since the Company's filing of its Quarterly Report on Form 10-Q for the three months ended March 31, 2014.

[4] The Company paid $112.2 million in cash on a gross basis for the net assets acquired through June 30, 2014. On a net basis, and for cash flow reporting, the Company paid $107.5 million through June 30, which represents the $112.2 million in cash paid on a gross basis minus the $4.7 million of cash acquired from the purchased companies. The Company has also recorded a liability for an additional $3.4 million to be paid for the acquisitions, of which approximately $2.5 million is expected to be paid in the third quarter of 2014.