Subsequent Event - Additional Information (Detail) - USD ($)	Oct. 19, 2016	Sep. 30, 2016	Oct. 21, 2015	May 29, 2014
Subsequent Event [Line Items]
Stock Repurchase Program, Authorized Amount			$ 35,000,000	$ 35,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 22,307,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock Repurchase Program, Authorized Amount	$ 35,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 57,307,000