EMPLOYEE BENEFIT PLANS - Narrative (Detail) - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019
Employee Stock Purchase Plan [Line Items]
Maximum matching contribution per dollar per employee contribution	$ 0.50
Maximum match per employee per calendar year	$ 1,000
Employer contributions vesting period	3 years
Employer contributions	$ 1,608,000	$ 1,319,000	$ 1,817,000
Multiemployer pension plan withdrawal obligation	1,838,000			$ 3,194,000
Withdrawal costs - multiemployer pension plan	3,591,000	$ 0	$ 0
Reversal of pension costs	$ 397,000
Contingent liability term	17 years
Multiemployer pension plan withdrawal obligation, undiscounted	$ 4,224,000
Estimated accumulated benefit obligation as complete withdrawal	$ 18,511,000
Class A Common Stock
Employee Stock Purchase Plan [Line Items]
Discount rate	15.00%
Stock issued under stock purchase plan (in shares)	23	26	41
Stock available for distribution under stock purchase plan (in shares)	94