Merger - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended			12 Months Ended
	Feb. 10, 2014	Jan. 02, 2014	Sep. 30, 2013	Feb. 28, 2014
Merger Agreement [Line Items]
Offer price to convert common shares held by the shareholders (except family shareholders) of the Corporation				$ 19.00
Consideration received by family shareholders				$ 0
Cash dividends paid to parent company				75,420
Parent Company [Member]
Merger Agreement [Line Items]
Cash dividend rate variable				LIBOR plus 11.5%
Cash dividend rate				11.50%
Cash dividends paid to parent company	50,000	7,225	18,195	75,420
Payment of dividends on the preferred stock				11,437
Preferred Stock [Member] | Parent Company [Member]
Merger Agreement [Line Items]
Approximate aggregate stated value of non-voting preferred stock issued in connection with merger				$ 245,000