Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the fiscal years ended December 31 were as follows:

	2018			2017
Balance as of January 1	$	686,108		$	683,683
Goodwill resulting from The Future Customer business combination		7,597			—
Goodwill resulting from DMS Disaster Consultants business combination		10,121			—
Goodwill resulting from We Are Vista business combination		14,392			—
Effect of foreign currency translation		(2,574	)		2,425
Total goodwill	$	715,644		$	686,108

Schedule of Other Intangibles

Other intangibles consisted of the following at December 31:    

	2018
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer-related	$	94,500	$	(59,289	)	$	35,211
Developed technology		733		(545	)		188
Total amortizable intangible assets		95,233		(59,834	)		35,399
Intangible with indefinite life		95		—			95
Total other intangible assets	$	95,328	$	(59,834	)	$	35,494

	2017
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer-related	$	84,878	$	(49,782	)	$	35,096
Developed technology		1,463		(1,350	)		113
Total amortizable intangible assets		86,341		(51,132	)		35,209
Intangible with indefinite life		95		—			95
Total other intangible assets	$	86,436	$	(51,132	)	$	35,304

Schedule of Estimated Future Amortization Expense Relating to Intangible Assets

The estimated future amortization expense relating to intangible assets is as follows:

Year ending December 31,
2019	$	8,345
2020		6,653
2021		5,574
2022		5,193
2023		4,768
Thereafter		4,866
Total	$	35,399