Business and Basis of Presentation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	1 Months Ended
	Sep. 30, 2013 Country	Feb. 21, 2013 Initial Public Offering	Sep. 16, 2013 Follow-on public offering
Business And Basis Of Presentation [Line Items]
Number of countries in which company provides services	30
Follow-on public offering, number of shares sold		7,273,750	5,063,760
Follow-on public offering, number of shares exercise of an overallotment option granted to the underwriters		948,750	660,490
Follow-on public offering, number of shares sold by selling stockholders		1,104,107	1,432,622
Follow-on public offering, price per share		$ 16.00	$ 30.50
Follow-on public offering, net proceeds received	$ 88,422	$ 88,400	$ 104,800
Number of common shares issued for convertible preferred stock		21,444,251