SEGMENT AND GEOGRAPHIC DISCLOSURES - Geographic Breakdown of Revenues and Total Long-Lived Assets (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	[1]	$ 874,553	$ 852,539	$ 1,163,314
Total Long-Lived Assets	[2]	311,957	337,460	376,018
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	[1]	600,665	606,818	838,385
Total Long-Lived Assets	[2]	270,684	289,507	328,832
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	[1]	108,659	87,028	127,574
Total Long-Lived Assets	[2]	8,595	8,291	8,625
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	[1]	108,433	104,667	126,794
Total Long-Lived Assets	[2]	27,295	34,674	32,517
Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	[1]	56,796	54,026	70,561
Total Long-Lived Assets	[2]	$ 5,383	$ 4,988	$ 6,044

[1] Revenues attributable to individual countries/geographic areas are based on the country of domicile of the legal entity that performs the work.

[2] Excludes goodwill, intangible assets not being amortized that are to be held and used, financial instruments and deferred tax assets.