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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 | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Combinations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 773,845 | $ 752,916 | $ 708,909
Operating income (loss) |  |  |  |  |  |  |  |  | 56,997 | 49,893 | (1,061)
Net income (loss) |  |  |  |  |  |  |  |  | $ 33,893 | $ 12,167 | $ (15,291)
Basic weighted average shares outstanding | 47,811 | 47,690 | 47,464 | 45,913 | 42,936 | 42,779 | 42,661 | 42,370 | 47,226 | 42,688 | 41,846
Basic earnings (loss) per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.72 | $ 0.29 | $ (0.37)
Diluted weighted average shares outstanding | 48,583 | 48,361 | 48,221 | 42,913 | 42,936 | 44,175 | 43,916 | 42,370 | 47,966 | 44,168 | 41,846
Diluted earnings (loss) per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.71 | $ 0.28 | $ (0.37)

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