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Business and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
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)
 
2016
 
2015
Computer equipment and software
 
2-7
 
$
166,385

 
$
148,195

Furniture and equipment
 
3-8
 
43,137

 
39,072

Leasehold improvements
 
2-15
 
96,603

 
87,103

 
 
 
 
$
306,125

 
$
274,370

Less — accumulated depreciation and amortization
 
 
 
(184,519
)
 
(165,637
)
Property, equipment, and leasehold improvements, net
 
 
 
$
121,606

 
$
108,733
Schedule of Changes in Intangible Assets Subject to Amortization
Changes in intangible assets subject to amortization during the two-year period ended December 31, 2016 were as follows (in thousands):
 
December 31, 2016
 
Trade
Names
 
Customer
Relationships
 
Content
 
Software
 
Non-Compete
 
Total
Gross cost, December 31, 2015
 
$
4,144

 
$
62,860

 
$
5,450

 
$
16,219

 
$
29,330

 
$
118,003

Additions due to acquisitions (1)
 
302

 
3,677

 
1,948

 
—

 
—

 
5,927

Intangibles fully amortized
 
—

 
—

 
(162
)
 
(125
)
 
—

 
(287
)
Foreign currency translation impact
 
(109
)
 
(3,168
)
 
(3,508
)
 
(69
)
 
(22
)
 
(6,876
)
Gross cost
 
4,337

 
63,369

 
3,728

 
16,025

 
29,308

 
116,767

Accumulated amortization (2), (3)
 
(1,737
)
 
(16,744
)
 
(2,033
)
 
(8,904
)
 
(10,548
)
 
(39,966
)
Balance, December 31, 2016
 
$
2,600

 
$
46,625

 
$
1,695

 
$
7,121

 
$
18,760

 
$
76,801


December 31, 2015
 
Trade
Names
 
Customer
Relationships
 
Content
 
Software
 
Non-Compete
 
Total
Gross cost, December 31, 2014
 
$
6,924

 
$
27,933

 
$
3,560

 
$
6,569

 
$
9,272

 
$
54,258

Additions due to acquisitions (1)
 
3,260

 
42,620

 
2,000

 
11,656

 
20,075

 
79,611

Intangibles fully amortized
 
(6,013
)
 
(7,210
)
 
—

 
—

 
—

 
(13,223
)
Foreign currency translation impact
 
(27
)
 
(483
)
 
(110
)
 
(2,006
)
 
(17
)
 
(2,643
)
Gross cost
 
4,144

 
62,860

 
5,450

 
16,219

 
29,330

 
118,003

Accumulated amortization (2), (3)
 
(681
)
 
(9,028
)
 
(3,525
)
 
(3,699
)
 
(4,526
)
 
(21,459
)
Balance, December 31, 2015
 
$
3,463

 
$
53,832

 
$
1,925

 
$
12,520

 
$
24,804

 
$
96,544

 
 
(1)
The additions are due to the Company's acquisitions. See Note 2 — Acquisitions for additional information.
(2)
Intangible assets are amortized against earnings over the following periods: Trade name—2 to 4 years; Customer relationships 4 to 7 years; Content—1.5 to 4 years; Software—3 years; Non-compete—3 to 5 years.

(3)
Aggregate amortization expense related to intangible assets was $24.8 million, $13.3 million, and $8.2 million in 2016, 2015, and 2014, respectively.
Schedule of Estimated Future Amortization Expense by Year From Amortizable Intangibles
The estimated future amortization expense by year from finite-lived intangibles is as follows (in thousands):
2017
$
23,356

2018
20,072

2019
15,081

2020
12,897

2021 and thereafter
5,395

 
$
76,801
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, 2016 (in thousands):
 
Research
 
Consulting
 
Events
 
Total
Balance, December 31, 2014 (1)
$
445,460

 
$
99,417

 
$
41,788

 
$
586,665

Additions due to acquisitions (2)
138,053

 
—

 
—

 
138,053

Foreign currency translation adjustments
(8,221
)
 
(1,005
)
 
(133
)
 
(9,359
)
Balance, December 31, 2015
$
575,292

 
$
98,412

 
$
41,655

 
$
715,359

Additions due to acquisitions (2)
28,465

 
—

 
5,843

 
34,308

Foreign currency translation adjustments
(8,307
)
 
(1,932
)
 
(975
)
 
(11,214
)
Balance, December 31, 2016
$
595,450

 
$
96,480

 
$
46,523

 
$
738,453

 
(1)
The Company does not have any accumulated goodwill impairment losses.

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