FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Deposits of cash outside the United States	$ 572,700
Cash and cash equivalents	$ 612,725	$ 551,031	$ 496,672	$ 446,401