Earnings per Share - Table Showing Outstanding Options and Warrants Excluded from Computation of Diluted Earning Per Share (Detail)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted earnings (loss) per share/unit	273,125	213,250
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted earnings (loss) per share/unit	1,875,028	1,875,018