Debt and Financing Arrangements - Summary of Recognized Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Total interest expense	$ 974	$ 1,521	$ 4,167	$ 4,509
2018 Credit Facility [Member]
Debt Instrument [Line Items]
Total interest expense	955	1,498	4,112	4,444
Other [Member]
Debt Instrument [Line Items]
Total interest expense	$ 19	$ 23	54	$ 65
Other Line of Credit [Member]
Debt Instrument [Line Items]
Total interest expense			$ 1