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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 | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Business Combinations [Abstract] |  |  |  |
Revenues | $ 189,026 | $ 201,608 | $ 373,623 | $ 381,518
Operating income | 17,448 | 16,850 | 24,517 | 22,751
Net income | $ 12,115 | $ 12,629 | $ 13,087 | $ 11,709
Weighted average common shares outstanding, basic | 48,348 | 47,464 | 48,176 | 46,693
Basic earnings per common share (in dollars per share) | $ 0.25 | $ 0.27 | $ 0.27 | $ 0.25
Weighted average common shares outstanding, diluted | 48,563 | 48,221 | 48,411 | 47,424
Diluted earnings per common share (in dollars per share) | $ 0.25 | $ 0.26 | $ 0.27 | $ 0.25

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