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Stockholders' Equity - Summary of Stockholders' Equity (Detail) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class A Common Stock      
Class Of Stock [Line Items]      
Common stock, shares outstanding, beginning balance 2,404,107 2,397,107 2,392,107
Issued 7,000 7,000 5,000
Common stock, shares outstanding, ending balance 2,411,107 2,404,107 2,397,107
Class B Common Stock      
Class Of Stock [Line Items]      
Common stock, shares outstanding, beginning balance 10,000,000 10,000,000 10,000,000
Common stock, shares outstanding, ending balance 10,000,000 10,000,000 10,000,000