Stockholders' Equity - Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at January 1, 2018	$ 290,529
Net income for the three months, ended March 31, 2018			$ 6,258
Estimated tax impact resulting from adoption of ASC 606	511	$ 854
Estimated tax impact resulting from adoption of ASC 606	(1,614)
Cash dividends declared	(2,589)
Common stock repurchase program	(1,927)
Amortization of stock based compensation	1,234
Repurchase of common stock for tax withholdings	(892)
Cumulative translation adjustment	(256)
Balance at March 31, 2018	$ 291,254