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Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in the carrying amount of goodwill by reportable business segment for the nine months ended September 30, 2014 were as follows (in thousands):
 
 
Learning
Solutions
 
Professional
& Technical
Services
 
Sandy
 
Performance
Readiness
Solutions
 
Energy
Services
 
Total
Balance as of December 31, 2013
$
60,187

 
$
37,690

 
$
653

 
$
9,795

 
$
8,662

 
$
116,987

Acquisitions
12,338

 
—

 
—

 
—

 
—

 
12,338

Foreign currency translation
(1,773
)
 
—

 
—

 
—

 
(38
)
 
(1,811
)
Balance as of September 30, 2014
$
70,752


$
37,690


$
653


$
9,795


$
8,624


$
127,514
Schedule of Finite-Lived Intangible Assets
The primary assets included in this category and their respective balances were as follows (in thousands):
 
September 30, 2014
 
 
 
 
 
 
Gross Carrying
 
Accumulated
 
Net Carrying
 
Amount
 
Amortization
 
Amount
Customer relationships
$
27,672

 
$
(16,655
)
 
$
11,017

Tradenames
191

 
(191
)
 
—

Intellectual property and other
2,355

 
(1,211
)
 
1,144

 
$
30,218


$
(18,057
)

$
12,161

 
 
 
 
 
 
December 31, 2013
 

 
 

 
 

Customer relationships
$
26,470

 
$
(13,070
)
 
$
13,400

Tradenames
191

 
(119
)
 
72

Intellectual property and other
2,364

 
(707
)
 
1,657

 
$
29,025


$
(13,896
)

$
15,129