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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 151,222 $ 160,269 $ 154,016 $ 133,802 $ 143,795 $ 151,133 $ 144,670 $ 125,432 $ 599,309 $ 565,030 $ 546,500
Operating income (loss) 9,855 18,277 (47,279) 6,564 9,997 17,378 15,596 1,974 (12,583) 44,945 31,866
Net (loss) income $ 20,020 $ 12,080 $ (53,675) $ (224) (11,973) 7,537 5,192 (7,614) (21,799) (6,858) (11,781)
Net (loss) income attributable to common stockholders         $ (11,973) $ 7,537 $ 5,195 $ (7,608) $ (21,799) $ (6,849) $ (12,969)
Earnings per common share:                      
Basic weighted average common shares outstanding (in shares) 42,033 41,951 41,811 41,584 41,422 41,377 41,132 40,996      
Basic earnings per share (in dollars per share) $ 0.48 $ 0.29 $ (1.28) $ (0.01) $ (0.29) $ 0.18 $ 0.13 $ (0.19)      
Diluted weighted average common shares outstanding (in shares) 43,394 43,295 41,811 41,584 41,422 42,287 41,598 40,996      
Diluted earnings per share (in dollars per share) $ 0.46 $ 0.28 $ (1.28) $ (0.01) $ (0.29) $ 0.18 $ 0.12 $ (0.19)