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Business and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
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)
 
2015
 
2014
Computer equipment and software
 
2-7
 
$
148,195

 
$
144,293

Furniture and equipment
 
3-8
 
39,072

 
37,221

Leasehold improvements
 
2-15
 
87,103

 
78,094

 
 
 
 
$
274,370

 
$
259,608

Less — accumulated depreciation and amortization
 
 
 
(165,637
)
 
(161,618
)
Property, equipment, and leasehold improvements, net
 
 
 
$
108,733

 
$
97,990
Schedule of Changes in Intangible Assets Subject to Amortization
Changes in intangible assets subject to amortization during the two-year period ended December 31, 2015 are as follows (in thousands):
 
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 (3), (4)
 
(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


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

 
 
(1)
The additions are due to the Company's 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 4 years; Customer relationships 4 to 7 years; Content—1.5 to 4 years; Software—3 years; Non-compete—3 to 5 years.

(4)
Aggregate amortization expense related to intangible assets was $13.3 million, $8.2 million, and $5.4 million in 2015, 2014, and 2013, 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):

2016
$
24,074

2017
21,468

2018
18,818

2019
14,321

2020
12,449

Thereafter
5,414

 
$
96,544
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, 2015 (in thousands):

 
Research
 
Consulting
 
Events
 
Total
Balance, December 31, 2013 (1)
$
376,568

 
$
100,677

 
$
41,958

 
$
519,203

Additions 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

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

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

(2)
The addition are due to the Company's acquisitions (See Note 2—Acquisitions for additional discussion). All of the recorded goodwill from these acquisitions has been included in the Research segment.