QUARTERLY FINANCIAL INFORMATION (UNAUDITED) - Summary of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								8 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Apr. 30, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 143,795	$ 151,133	$ 144,670	$ 125,432	$ 140,024	$ 146,185	$ 143,714	$ 116,577	$ 368,374	$ 565,030	$ 546,500	$ 497,633
Operating income	9,997	17,378	15,596	1,974	4,702	12,696	11,342	3,126	22,110	44,945	31,866	11,916
Net (loss) income	(11,973)	7,537	5,192	(7,614)	(7,020)	2,259	943	(7,963)	(5,810)	(6,858)	(11,781)	(27,404)
Net (loss) income attributable to common stockholders	$ (11,973)	$ 7,537	$ 5,195	$ (7,608)	$ (7,019)	$ 2,296	$ 1,025	$ (9,271)	$ (6,018)	$ (6,849)	$ (12,969)	$ (23,095)
Earnings per common share:
Basic weighted average common shares outstanding (in shares)	41,422	41,377	41,132	40,996	40,889	40,810	40,447	40,417
Basic earnings per share (in USD per share)	$ (0.29)	$ 0.18	$ 0.13	$ (0.19)	$ (0.17)	$ 0.06	$ 0.03	$ (0.23)
Diluted weighted average common shares outstanding (in shares)	41,422	42,287	41,598	40,996	40,889	41,283	40,846	40,417
Diluted earnings per share (in USD per share)	$ (0.29)	$ 0.18	$ 0.12	$ (0.19)	$ (0.17)	$ 0.06	$ 0.03	$ (0.23)