Goodwill and Intangible Assets - Additional Information (Detail)	1 Months Ended	6 Months Ended	12 Months Ended
	Jul. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) Reporting_Unit	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Goodwill [Line Items]
Number of reporting units | Reporting_Unit		8
Number of reporting units including goodwill | Reporting_Unit		7
Number of reporting units, fair value in excess of carrying value | Reporting_Unit		3
Number of reporting units, goodwill not impaired | Reporting_Unit		7
Goodwill Impairment Loss		$ 0	$ 21,792,000
Goodwill		299,669,000	$ 299,409,000	$ 311,247,000
Clearlink [Member]
Goodwill [Line Items]
Goodwill Impairment Loss		0
Goodwill		83,400,000
Symphony [Member]
Goodwill [Line Items]
Goodwill Impairment Loss	$ 21,800,000
Goodwill		19,300,000
Latin America [Member]
Goodwill [Line Items]
Goodwill Impairment Loss		0
Goodwill		18,100,000
Qelp [Member]
Goodwill [Line Items]
Goodwill Impairment Loss		0
Goodwill		$ 10,400,000