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Earnings per Common Share - Additional Information (Detail) (USD $)	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012 Equity Option [Member]	Jun. 30, 2012 Equity Option [Member]	Jun. 30, 2012 Equity Option [Member] Minimum [Member]	Jun. 30, 2012 Equity Option [Member] Minimum [Member]	Jun. 30, 2012 Equity Option [Member] Maximum [Member]	Jun. 30, 2012 Equity Option [Member] Maximum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	0	29,500	29,500
Exercise price of stock options not considered in computing diluted earnings per common share				$ 20.50	$ 20.50	$ 35.00	$ 35.00
Dilutive securities	0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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