Stockholder's Equity - Additional information (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Equity [Abstract]
Common stock, shares authorized	250,000,000	250,000,000
Common stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, par value	$ 0.01	$ 0.01
Voting rights per share	One vote per share