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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 174,724 $ 172,832 $ 165,649 $ 147,455 $ 151,222 $ 160,269 $ 154,016 $ 133,802 $ 660,660 $ 599,309 $ 565,030
Operating income (loss) (5,138) 28,884 15,149 838 9,855 18,277 (47,279) 6,564 39,733 (12,583) 44,945
Net (loss) income $ (13,676) $ 22,302 $ 1,704 $ (3,910) $ 20,020 $ 12,080 $ (53,675) $ (224) $ 6,420 $ (21,799) $ (6,858)
Earnings per common share:                      
Basic weighted average shares outstanding (in shares) 42,936 42,779 42,661 42,370 42,033 41,951 41,811 41,584 42,688 41,846 41,233
Basic earnings per common share (in dollars per share) $ (0.32) $ 0.52 $ 0.04 $ (0.09) $ 0.48 $ 0.29 $ (1.28) $ (0.01) $ 0.15 $ (0.52) $ (0.17)
Diluted weighted average shares outstanding (in shares) 42,936 44,175 43,916 42,370 43,394 43,295 41,811 41,584 44,168 41,846 41,233
Diluted earnings per common share (in dollars per share) $ (0.32) $ 0.50 $ 0.04 $ (0.09) $ 0.46 $ 0.28 $ (1.28) $ (0.01) $ 0.15 $ (0.52) $ (0.17)