Acquisitions - Summary of Identifiable Intangible Assets Acquired and Their Respective Weighted Average Lives (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Assigned Value	$ 4,815
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Assigned Value	3,605
Intangible Assets, Useful Life	7 years 6 months
Research Content [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Assigned Value	1,080
Intangible Assets, Useful Life	1 year 6 months
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Assigned Value	$ 130
Intangible Assets, Useful Life	1 year