EMPLOYEES' BENEFIT PLAN- Narratives (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent	25.00%
Employee contribution percent maximum to get employer matching contribution	4.00%
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount	$ 15,000	$ 15,000	$ 13,000
Total plan expense	2,200,000	800,000	700,000
United States And Virign Islands Operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount	$ 17,500	$ 17,500	$ 17,000