RETIREMENT AND OTHER EMPLOYEE BENEFIT PROGRAMS - Schedule of Multiemployer Defined Benefit Pension Plans (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Pension Plan Private Sanitation Union, Local 813 IBT
Multiemployer Plans [Line Items]
Plan Employer ID Number		131975659
Plan #		001
Pension Protection Act Zone Status	[1],[2]	Red	Red
FIP/RP Status	[3]	Implemented
Company Contributions	[4]	$ 0.6	$ 0.6
Expiration Date of Collective Bargaining Agreements, First		Jun. 30, 2019
Expiration Date of Collective Bargaining Agreements, Last		Mar. 31, 2020
Nurses and Local 813 IBT Retirement Plan
Multiemployer Plans [Line Items]
Plan Employer ID Number		133628926
Plan #		001
Pension Protection Act Zone Status	[1],[2]	Green	Green
FIP/RP Status	[3]	NA
Expiration Date of Collective Bargaining Agreement		various dates

[1] A Multiemployer Pension Plan that has been certified as endangered, seriously endangered or critical may begin to levy a statutory surcharge on contribution rates. Once authorized, the surcharge is at the rate of 5% for the first 12 months and 10% for any periods thereafter, until certain conditions are met. Contributing employers, however, may eliminate the surcharge by entering into a collective bargaining agreement that meets the requirements of the applicable FIP or RP.

[2] Zone status is defined by the Department of Labor and the Pension Protection Act of 2006 and represents the level at which the plan is funded. Plans in the red zone are less than 65% funded, while plans in the green zone are at least 80% funded. Status is based on information received from the Multiemployer Pension Plans and is certified by the pension plans actuary.

[3] The "FIP/RP Status" column indicates Multiemployer Pension Plans for which a Funding Improvement Plan ("FIP”) or a Rehabilitation Plan ("RP") has been implemented or is pending. The most recent Pension Protection Act zone status available in 2018 and 2017 is for the plans’ year-end December 31, 2017 and 2016, respectively.

[4] The Company was listed in the Form 5500 for the Pension Plan Private Sanitation Union Local 813 IBT as individually significant for contributing more than 5% of total contributions to such plan during the plan years ended December 31, 2017 and 2016. At the date these financial statements were issued, Forms 5500 were not available for the Multiemployer Pension Plans for the year ended December 31, 2018.