Goodwill and Intangible Assets, net (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table presents changes in the carrying amount of goodwill by reportable segment for the periods presented (in thousands):

	GMS		NSS		Total
Balance as of December 31, 2018	$	208,593	$	199,432	$	408,025
Acquisitions	—		—		—
Other	—		1,563		1,563
Balance as of December 31, 2019	$	208,593	$	200,995	$	409,588
Acquisitions	—		181,080		181,080
Other	—		—		—
Balance as of December 31, 2020	$	208,593	$	382,075	$	590,668

Intangible Assets, net

The components of intangible assets, net consisted of the following as of the dates presented (in thousands):

	December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	$	390,900	$	(149,163)	$	241,737
Technology	1,700		(1,700)		—
Trade name	24,800		(8,327)		16,473
Total	$	417,400	$	(159,190)	$	258,210
	December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	$	286,900	$	(116,923)	$	169,977
Technology	1,700		(1,700)		—
Trade name	16,900		(6,413)		10,487
Total	$	305,500	$	(125,036)	$	180,464

Estimated Amortization Expense in Future Years

Estimated amortization expense in future years is expected to be:

	As of
	December 31, 2020
2021	$	50,106
2022	50,089
2023	40,666
2024	33,782
2025	28,015
Thereafter	55,552
Total	$	258,210