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Business and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Property, Plant and Equipment
The Company's total fixed assets, less accumulated depreciation and amortization, consisted of the following (in thousands):
 
 
Useful Life
 
December 31,
Category
 
(Years)
 
2014
 
2013
Computer equipment and software
 
2-7
 
$
144,293

 
$
136,640

Furniture and equipment
 
3-8
 
37,221

 
34,024

Leasehold improvements
 
2-15
 
78,094

 
70,261

 
 
 
 
$
259,608

 
$
240,925

Less — accumulated depreciation and amortization
 
 
 
(161,618
)
 
(149,166
)
Property, equipment, and leasehold improvements, net
 
 
 
$
97,990

 
$
91,759
Schedule of Changes in Intangible Assets Subject to Amortization
Changes in intangible assets subject to amortization during the two-year period ended December 31, 2014 are as follows (in thousands):
 
December 31, 2014
 
Trade
Names
 
Customer
Relationships
 
Content
 
Software
 
Non-Compete
 
Total
Gross cost, December 31, 2013
 
$
6,023

 
$
10,146

 
$
3,496

 
$
2,143

 
$
—

 
$
21,808

Additions due to acquisitions (1)
 
915

 
18,054

 
206

 
5,000

 
7,800

 
31,975

Non-competition agreement (2)
 
—

 
—

 
—

 
—

 
1,500

 
1,500

Foreign currency translation impact
 
(14
)
 
(267
)
 
(142
)
 
(574
)
 
(28
)
 
(1,025
)
Gross cost
 
6,924

 
27,933

 
3,560

 
6,569

 
9,272

 
54,258

Accumulated amortization (3), (4)
 
(6,202
)
 
(11,072
)
 
(2,246
)
 
(2,603
)
 
(1,446
)
 
(23,569
)
Balance, December 31, 2014
 
$
722

 
$
16,861

 
$
1,314

 
$
3,966

 
$
7,826

 
$
30,689


December 31, 2013
 
Trade
Names
 
Customer
Relationships
 
Content
 
Software
 
Total
Gross cost, December 31, 2012
 
$
6,019

 
$
10,562

 
$
3,447

 
$
2,124

 
$
22,152

Foreign currency translation impact
 
4

 
(416
)
 
49

 
19

 
(344
)
Gross cost
 
6,023

 
10,146

 
3,496

 
2,143

 
21,808

Accumulated amortization (3), (4)
 
(4,817
)
 
(8,372
)
 
(1,388
)
 
(1,124
)
 
(15,701
)
Balance, December 31, 2013
 
$
1,206

 
$
1,774

 
$
2,108

 
$
1,019

 
$
6,107

 
 
(1)
The additions are due to the Company's 2014 Acquisitions. See Note 2 — Acquisitions for additional information.

(2)
The non-competition intangible relates to a separation agreement with the Company's former CFO.
(3)
Intangible assets are amortized against earnings over the following periods: Trade name—2 to 5 years; Customer relationships 4 to 7 years; Content—1.5 to 4 years; Software—3 years; Non-compete—4 to 5 years.

(4)
Aggregate amortization expense related to intangible assets was $8.2 million, $5.4 million, and $4.4 million in 2014, 2013, and 2012, respectively.
Schedule of Estimated Future Amortization Expense by Year From Amortizable Intangibles
The estimated future amortization expense by year from amortizable intangibles is as follows (in thousands):

2015
$
8,094

2016
6,956

2017
5,507

2018
4,330

2019
2,807

Thereafter
2,995

 
$
30,689
Schedule of Changes to The Carrying Amount of Goodwill by Reporting Unit
The following table presents changes to the carrying amount of goodwill by segment during the two-year period ended December 31, 2014 (in thousands):

 
Research
 
Consulting
 
Events
 
Total
Balance, December 31, 2012 (1)
$
377,225

 
$
100,349

 
$
41,932

 
$
519,506

Foreign currency translation adjustments
(657
)
 
328

 
26

 
(303
)
Balance, December 31, 2013
$
376,568

 
$
100,677

 
$
41,958

 
$
519,203

Addition due to acquisitions (2)
78,373

 
—

 
—

 
78,373

Foreign currency translation adjustments
(9,481
)
 
(1,260
)
 
(170
)
 
(10,911
)
Balance, December 31, 2014
$
445,460

 
$
99,417

 
$
41,788

 
$
586,665

 
 
(1)
The Company does not have an accumulated goodwill impairment loss.

(2)