Employee Benefits and Stock Compensation - Summary of Stock Option and SSARs Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning Balance	87,000	107,000	109,000
Number of Shares, Granted	49,000	0	0
Number of Shares, Exercised	0	0	0
Number of Shares, Expired	(28,000)	0	0
Number of Shares, Cancelled	(6,000)	(20,000)	(2,000)
Number of Shares, Ending Balance	102,000	87,000	107,000
Weighted Average Exercise Price, Beginning Balance	$ 105.60	$ 107.10	$ 106.05
Weighted Average Exercise Price, Granted	$ 11.00	$ 0	$ 0
Weighted Average Exercise Price, Exercised	$ 0	$ 0	$ 0
Weighted Average Exercise Price, Expired	$ 85.40	$ 0	$ 0
Weighted Average Exercise Price, Cancelled	$ 113.57	$ 113.30	$ 100.70
Weighted Average Exercise Price, Ending Balance	$ 65.10	$ 105.60	$ 107.10
Aggregate Intrinsic Value, Beginning Balance	$ 0	$ 0	$ 0
Aggregate Intrinsic Value, Ending Balance	$ 0	$ 0	$ 0
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option or SSAR Exercise Price Per Share, Beginning Balance	$ 85.40	$ 85.40	$ 85.40
Option or SSAR Exercise Price Per Share, Cancelled	$ 111.10	$ 85.40	$ 85.40
Option or SSAR Exercise Price Per Share, Ending Balance	$ 11.00	$ 85.40	$ 85.40
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option or SSAR Exercise Price Per Share, Beginning Balance	$ 136.80	$ 136.80	$ 136.80
Option or SSAR Exercise Price Per Share, Granted	$ 11.00	$ 0	$ 0
Option or SSAR Exercise Price Per Share, Exercised	$ 0	$ 0	$ 0
Option or SSAR Exercise Price Per Share, Expired	$ 85.40	$ 0	$ 0
Option or SSAR Exercise Price Per Share, Cancelled	$ 136.80	$ 133.60	$ 136.80
Option or SSAR Exercise Price Per Share, Ending Balance	$ 133.60	$ 136.80	$ 136.80