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BUSINESS COMBINATIONS - Schedule of Unaudited Pro forma Combined Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Combination and Asset Acquisition [Abstract]
Revenues	$ 248,981	$ 225,580	$ 696,391	$ 646,004
Operating income	26,996	20,100	59,526	43,660
Net income	$ 14,996	$ 12,976	$ 26,542	$ 21,845
Weighted average common shares outstanding, basic (in shares)	51,389	48,370	51,312	48,241
Basic earnings per common share (in dollars per share)	$ 0.29	$ 0.27	$ 0.52	$ 0.45
Weighted average common shares outstanding, diluted (in shares)	51,586	48,619	51,506	48,481
Diluted earnings per common share (in dollars per share)	$ 0.29	$ 0.27	$ 0.52	$ 0.45

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- Definition

The pro forma operating income for the period as if the business combination or combinations had been completed at the beginning of the period.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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