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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								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
Business Combinations [Abstract]
Revenues									$ 699,659	$ 672,898	$ 642,773
Operating income (loss)									43,561	(6,601)	50,970
Net income (loss) attributable to common stockholders									$ 8,579	$ (18,408)	$ (3,446)
Basic earnings per common share attributable to common stockholders (in dollars per share)									$ 0.20	$ (0.44)	$ (0.08)
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
Diluted earnings per common share attributable to common stockholders (in dollars per share)									$ 0.19	$ (0.44)	$ (0.08)
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

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
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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+ References

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-Name Accounting Standards Codification
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ 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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-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256

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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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