Shareholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Class of Stock [Line Items]
Preferred stock dividends (in dollars per share)	$ 150
Preferred stock dividend rate	6.00%	6.00%
Other Comprehensive loss, pension and postretirements obligations, before tax	$ 38	$ 29
Change in pension and postretirement obligations, net of tax	$ 13	$ 10
Depositary Shares [Member]
Class of Stock [Line Items]
Conversion of Stock, Shares Converted	1,950.0