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Stockholders' Equity - Summary of Stockholders' Equity (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Class A Common Stock
Class Of Stock [Line Items]
Common stock, shares outstanding, beginning balance	2,397,107	2,392,107	2,386,107
Issued	7,000	5,000	6,000
Common stock, shares outstanding, ending balance	2,404,107	2,397,107	2,392,107
Class B Common Stock
Class Of Stock [Line Items]
Common stock, shares outstanding, beginning balance				10,000,000
Common stock, shares outstanding, ending balance	10,000,000	10,000,000	10,000,000	10,000,000