Business Segment Information - Summary of Revenues Attributed to a Geographic Region Based on the Location of the Customer (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 48,021	$ 52,102
CANADA [Member]
Segment Reporting Information [Line Items]
Revenues	27,195	29,488
UNITED STATES [Member]
Segment Reporting Information [Line Items]
Revenues	11,043	16,530
Other Countries [Member]
Segment Reporting Information [Line Items]
Revenues	$ 9,783	$ 6,084