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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Combinations [Abstract] |  |  |  |
Revenues | $ 202,910 | $ 208,234 | $ 577,994 | $ 591,212
Operating income | 20,660 | 19,351 | 45,342 | 42,266
Net income | $ 15,119 | $ 12,813 | $ 28,216 | $ 24,532
Weighted average common shares outstanding, basic | 48,370 | 47,690 | 48,241 | 47,029
Basic earnings per common share (in dollars per share) | $ 0.31 | $ 0.27 | $ 0.58 | $ 0.52
Weighted average common shares outstanding, diluted | 48,619 | 48,361 | 48,481 | 47,660
Diluted earnings per common share (in dollars per share) | $ 0.31 | $ 0.26 | $ 0.58 | $ 0.51

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