SEGMENT REPORTING - Schedule of Revenue from External Customers (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	$ 29,465	$ 40,981
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	2,995	5,986
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	$ 26,470	$ 34,995