Related Party Transactions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Oct. 20, 2012	Aug. 03, 2013
Related Party Transaction [Line Items]
Parent Company's investment in initial public offering	$ 5.0
Advisory services agreement period	5 years
Additional renewal period of agreement	5 years
Related party transaction charges		0.2
Tranche One [Member]
Related Party Transaction [Line Items]
Parent Company's investment in initial public offering	2.5
Tranche Two [Member]
Related Party Transaction [Line Items]
Parent Company's investment in initial public offering	$ 2.5