Earnings Per Share - Additional Information (Detail)	Sep. 30, 2013
Preferred Stock Series A [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Conversion of stock, shares converted	2.2955
Preferred Stock Series D [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Conversion of stock, shares converted	1.10