EMPLOYEES' BENEFIT PLAN- Narratives (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent	50.00%
Employee contribution percent maximum to get employer matching contribution	6.00%
Total plan expense	$ 1,500,000	$ 900,000	$ 1,100,000
Matching Constribution Description	The matching contribution of fifty cents for every dollar of the employee’s contribution is comprised of: (i) twenty-five cents for every dollar of the employee’s contribution up to 6% of the employee’s eligible compensation to be paid to the Plan as of each bi-weekly payroll; and, (ii) an additional twenty-five cents for every dollar of the employee’s contribution up to 6% of the employee’s eligible compensation to be deposited as a lump sum as of the second payroll of the month of January of the Plan Year following that in which the elective deferrals were made.
PUERTO RICO [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount	$ 15,000	15,000	15,000
United States And Virign Islands Operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount	$ 18,500	$ 18,000	$ 18,000