Business Combinations - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		3 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Mar. 31, 2014 TalentBin, Inc and Gozaik LLC Acquisition
Business Acquisition [Line Items]
Aggregate consideration for acquisitions	$ 27,005		$ 27,005
Consideration in escrow accounts			1,750
Business acquisitions goodwill amount	915,024	895,518	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