Accumulated Other Comprehensive Income (Loss) ("AOCI/L") - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 201,502	$ 173,409	$ 185,766	$ 158,088
Foreign currency translation	(1,508)	2,577	(3,086)	1,542
Reclassification of AOCI/L to income, net of tax	(4)	0	(4)	0
Ending Balance	201,152	174,708	201,152	174,708
Marketable Investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	0		0
Foreign currency translation	0		0
Unrealized loss before reclassification, net of tax	(4)		(4)
Reclassification of AOCI/L to income, net of tax	0		0
Ending Balance	(4)		(4)
Interest Rate Swap [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(492)	(1,240)	(821)	(104)
Foreign currency translation	0	0	0	0
Unrealized loss before reclassification, net of tax	(3)	(23)	(7)	(1,330)
Reclassification of AOCI/L to income, net of tax	131	228	464	399
Ending Balance	(364)	(1,035)	(364)	(1,035)
Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(1,447)	(5,788)	131	(4,753)
Foreign currency translation	(1,508)	2,577	(3,086)	1,542
Unrealized loss before reclassification, net of tax	0	0	0	0
Reclassification of AOCI/L to income, net of tax	0	0	0	0
Ending Balance	(2,955)	(3,211)	(2,955)	(3,211)
Total AOCI/L [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(1,939)	(7,028)	(690)	(4,857)
Foreign currency translation	(1,508)	2,577	(3,086)	1,542
Unrealized loss before reclassification, net of tax	(7)	(23)	(11)	(1,330)
Unrealized loss before reclassification, net of tax	(7)	(23)	(11)	(1,330)
Reclassification of AOCI/L to income, net of tax	131	228	464	399
Ending Balance	$ (3,323)	$ (4,246)	$ (3,323)	$ (4,246)