Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	0 Months Ended
	Jun. 30, 2014	Jul. 21, 2014 Subsequent Event	Jul. 21, 2014 Subsequent Event
Subsequent Event [Line Items]
Business acquisition, date of agreement	Jul. 21, 2014
Cash to be paid to acquire Retail Decisions		$ 205.0
Business Acquisition, expected to close by date	Sep. 30, 2014
Maximum financing under Commitment Letter			$ 150