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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Combinations [Abstract]
Revenues	$ 189,970	$ 183,084	$ 358,243	$ 348,373
Operating income	15,638	16,606	20,326	18,919
Net income (loss)	$ 11,954	$ 2,504	$ 10,357	$ (597)
Basic weighted average common share outstanding (in shares)	47,464	42,661	46,693	42,516
Basic earnings per common share attributable to common stockholders (in dollars per share)	$ 0.25	$ 0.06	$ 0.22	$ (0.01)
Diluted weighted average shares outstanding (in shares)	48,221	43,916	47,424	42,516
Diluted earnings per share attributable to common stockholders (in dollars per share)	$ 0.25	$ 0.06	$ 0.22	$ (0.01)

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- Definition

The pro forma operating income for the period as if the business combination or combinations had been completed at the beginning of the period.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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