SEGMENT AND GEOGRAPHIC INFORMATION - Summary of Total Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Total revenue	$ 318,920	$ 302,192	$ 272,048	$ 268,952	$ 285,887	$ 307,679	$ 261,110	$ 100,743	$ 1,162,112	$ 955,419	$ 453,669
United States
Segment Reporting Information [Line Items]
Total revenue									729,373	681,569	348,354
Europe
Segment Reporting Information [Line Items]
Total revenue									190,588	137,411	46,253
Asia
Segment Reporting Information [Line Items]
Total revenue									99,277	61,566	27,685
Rest of the world
Segment Reporting Information [Line Items]
Total revenue									$ 142,874	$ 74,873	$ 31,377