Income Taxes - Summary of Tax Years that Remain Subject to Examination by Major Jurisdiction (Detail)	6 Months Ended
	Jun. 30, 2021
United States [Member] | United States - Federal [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2014 - 2015; 2017 - 2020
United States [Member] | United States - State [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2016 - 2020
Examinations in progress	2015 - 2018
Canada [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2013 - 2018; 2020
Examinations in progress	2019
Germany [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2020
France [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2018 - 2020
United Kingdom [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2019 - 2020
Philippines [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2019 - 2020
Examinations in progress	2018