Stockholders' Equity - Additional Information (Detail)		9 Months Ended
	May 02, 2018 shares	Sep. 30, 2018 $ / shares shares	Feb. 16, 2018 shares	Dec. 31, 2017 shares	Feb. 16, 2017 shares
Equity, Class of Treasury Stock [Line Items]
Common stock, par value | $ / shares		$ 0.01
Common stock, shares authorized	80,000,000	120,000,000		120,000,000
Stock split	2
February 2017 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized shares					5,920,000
Number of shares repurchased by the Company		0
February 2018 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized shares			5,800,000
Number of shares repurchased by the Company		250,044