Summary of Business and Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	1 Months Ended			3 Months Ended
	Mar. 31, 2013 Segment	Mar. 18, 2013 Follow On Public Offering	Mar. 18, 2013 Follow On Public Offering Vantage Point	Mar. 18, 2013 Follow On Public Offering Underwriters Overallotment Option	Mar. 31, 2013 Contingent Consideration CS	Mar. 31, 2012 Contingent Consideration CS	Mar. 31, 2013 Benefit Concepts, Inc.	Mar. 31, 2013 Contingent Consideration FBM	Mar. 31, 2012 Contingent Consideration FBM
Summary Of Business And Significant Accounting Policies [Line Items]
Reporting unit	1
Revenue streams	3
Common stock sold		500,000	5,131,115	844,667
Common stock price		$ 24.00
Proceeds from public offering net of underwriters commissions and discounts		$ 11.6
Changes in fair value of the contingent considerations					$ 0.2	$ 0.1	$ 0.2	$ 0	$ 0.4