Stockholders' Equity - Treasury Stock (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Equity, Class of Treasury Stock [Line Items]
Shares purchased during period (shares)	127,792
Total number of shares purchased (shares)	127,792
Average price paid per share (usd per share) | $ / shares	$ 15.04
Average price paid per share (usd per share) | $ / shares	$ 15.04
Treasury stock acquired during period | $	$ 1,927
Commissions paid to acquire shares | $	$ 5,112
Common Stock Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Shares purchased during period (shares)	127,792
Total number of shares purchased (shares)	127,792
Treasury stock acquired during period | $	$ 8,077