Acquisition of C Technologies, Inc. (Unaudited Supplemental Pro Forma Information) (Detail) - C Technologies [Member] - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Total revenue		$ 140,515	$ 102,535
Net income	$ 1,500	$ 20,560	$ 8,060
Basic		$ 0.46	$ 0.17
Diluted		$ 0.43	$ 0.17