The Company - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	1 Months Ended
	Oct. 30, 2013	Oct. 31, 2013
Organization And Nature Of Business [Line Items]
Common stock initial public offering	6,720,000	6,720,000
Public offering price of the shares sold	$ 10.00	$ 10.00
Net proceeds from initial public offering	$ 68.3	$ 68.3
Underwriting discounts and commissions	5.4	5.4
Expenses for initial public offering	$ 3.6	$ 3.6
Stock Offering Underwriter Over-Allotment Option [Member]
Organization And Nature Of Business [Line Items]
Common stock initial public offering	1,008,000	1,008,000