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Stockholders' Equity - Summary of Stockholders' Equity (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Class A Common stock
Class of Stock [Line Items]
Issued	6,000	10,800	5,000
Common stock, shares outstanding	2,392,107	2,386,107	2,375,307	2,370,307
Class B Common stock
Class of Stock [Line Items]
Issued
Common stock, shares outstanding	10,000,000	10,000,000	10,000,000	10,000,000

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

Number of new stock issued during the period.