Stockholders' Equity - Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at January 1, 2017				$ 322,087
Net income for the six months ended June 30, 2017		$ 1,498	$ 3,451	2,352	$ 6,895
Cash dividends declared				(5,221)
Common stock repurchase program	$ (10,000)			(10,024)
Amortization of stock based compensation				1,953
Other				363
Balance at June 30, 2017	$ 311,510	$ 311,510		$ 311,510