Common and Preferred Stock - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Class of Stock [Line Items]
Common stock, shares authorized	5,000	5,000
Common stock, shares issued	4,790	4,802
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Put Options [Member]
Class of Stock [Line Items]
Common stock, held by management	210.5
Fair value adjusted to common stock	$ 19,983