SEGMENT AND GEOGRAPHIC INFORMATION - REVENUE BY GEOGRAPHIC REGION (Detail)s - 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
Net revenue by geographic region:
Total net revenue	$ 571,555	$ 476,474	$ 420,167	$ 311,552	$ 377,206	$ 414,221	$ 346,974	$ 275,297	$ 1,779,748	$ 1,413,698	$ 1,082,938
United States
Net revenue by geographic region:
Total net revenue									999,128	742,963	623,080
Europe
Net revenue by geographic region:
Total net revenue									515,696	449,577	322,645
Asia Pacific
Net revenue by geographic region:
Total net revenue									157,183	120,629	69,923
Canada and Latin America
Net revenue by geographic region:
Total net revenue									$ 107,741	$ 100,529	$ 67,290