SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Software
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	3 years
Minimum | Distribution Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	14 years
Minimum | Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	13 years
Minimum | Technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	7 years
Maximum | Distribution Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	22 years
Maximum | Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	17 years
Maximum | Technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	14 years
Successor
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	$ 656,083	$ 613,131
Intangible assets	688,083	645,131
Successor | Distribution Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	428,499	385,319
Successor | Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	92,049	97,105
Successor | Technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	121,253	130,707
Successor | Other
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	14,282	0
Successor | Insurance Licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 32,000	$ 32,000