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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 200,240 $ 202,667 $ 188,767 $ 182,910 $ 193,619 $ 198,547 $ 187,459 $ 163,664 $ 774,584 $ 743,290 $ 660,660
Operating income 14,208 20,633 17,444 7,012 14,604 18,485 15,544 4,442 59,297 53,075 39,733
Net income $ 62,917 $ 15,117 $ 12,113 $ 959 $ 9,066 $ 12,386 $ 11,915 $ (1,714) $ 91,106 $ 31,653 $ 6,420
Earnings per common share:                      
Basic weighted average shares outstanding 50,436 48,370 48,348 48,005 47,811 47,690 47,464 45,913 48,793 47,226 42,688
Basic earnings per common share (in dollars per share) $ 1.25 $ 0.31 $ 0.25 $ 0.02 $ 0.19 $ 0.26 $ 0.25 $ (0.04) $ 1.87 $ 0.67 $ 0.15
Diluted weighted average shares outstanding 50,719 48,619 48,563 48,262 48,583 48,361 48,221 45,913 49,045 47,966 44,168
Diluted earnings per common share (in dollars per share) $ 1.24 $ 0.31 $ 0.25 $ 0.02 $ 0.19 $ 0.26 $ 0.25 $ (0.04) $ 1.86 $ 0.66 $ 0.15
Increase (decrease) in valuation allowance $ (53,644)               $ (61,317) $ (3,539)