BUSINESS COMBINATIONS - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Aggregate consideration for acquisitions		$ 0	$ 27,005
Goodwill		$ 497,345		$ 501,026
TalentBin, Inc and Gozaik LLC Acquisition
Business Acquisition [Line Items]
Aggregate consideration for acquisitions	$ 27,005
Consideration in escrow accounts	1,750
Goodwill	25,061
Business acquisitions deferred tax assets	907
Business acquisitions purchased technology	1,740
Business acquisitions other intangibles	730
Business acquisitions other assets	249
Business acquisitions liabilities	1,482
Goodwill deductible for tax purposes	$ 10,500