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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Combinations [Abstract]
Revenues	$ 176,848	$ 171,390	$ 502,399	$ 483,480
Operating income (loss)	29,182	19,001	46,083	(20,216)
Net income (loss)	$ 22,464	$ 12,486	$ 20,755	$ (40,579)
Basic weighted average common share outstanding (in shares)	42,779	41,951	42,605	41,783
Basic earnings per common share attributable to common stockholders (in dollars per share)	$ 0.53	$ 0.30	$ 0.49	$ (0.97)
Diluted weighted average shares outstanding (in shares)	44,175	43,295	43,938	41,783
Diluted earnings per share attributable to common stockholders (in dollars per share)	$ 0.51	$ 0.29	$ 0.47	$ (0.97)

X

- 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.

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ References

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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-Publisher FASB
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-Topic 260
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-Section 45
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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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