Stockholders' Equity - Summary of Purchase and Sale of Common Stock (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary Of Common Stock That Were Purchased And Sold [Abstract]
Shares of common stock purchased	5,900	13,650	17,685
Aggregate purchase price of shares purchased	$ 158,060	$ 158,883	$ 147,079
Shares of common stock sold	11,719	14,882	62,715
Aggregate sale price of shares sold	$ 158,060	$ 206,794	$ 670,831