Changes in Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income ("AOCI") by Component (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2014	$ 9,259
Other comprehensive loss before classification, net of tax	1,253
Amount reclassified from AOCI	77
Net current period other comprehensive loss	1,330	$ (682)
Balance at September 30, 2015	10,589
Stockholders' equity attributable to parent	254,863		$ 254,802
Available-for-Sale Securities Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2014	2,394
Other comprehensive loss before classification, net of tax	148
Amount reclassified from AOCI	77
Net current period other comprehensive loss	225
Balance at September 30, 2015	2,619
Foreign Currency Translation Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2014	8,561
Other comprehensive loss before classification, net of tax	1,105
Net current period other comprehensive loss	1,105
Balance at September 30, 2015	9,666
Pension Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2014	(1,696)
Balance at September 30, 2015	(1,696)
Accumulated Other Comprehensive Income [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net current period other comprehensive loss	1,330
Stockholders' equity attributable to parent	$ 10,589		$ 9,259