Subsequent Events - Additional Information (Detail) - Subsequent Event [Member]	Oct. 25, 2016 USD ($) $ / shares
Subsequent Event [Line Items]
Share repurchase program, new limit amount | $	$ 25,000,000
Dividend Declared [Member]
Subsequent Event [Line Items]
Cash dividend per share	$ 0.18
Date of payment to shareholders entitled to dividends	Dec. 29, 2016
Date of record of shareholders entitled to dividends	Dec. 15, 2016
Extraordinary Dividend Declared [Member]
Subsequent Event [Line Items]
Cash dividend per share	$ 3.25
Date of payment to shareholders entitled to dividends	Dec. 29, 2016
Date of record of shareholders entitled to dividends	Dec. 15, 2016