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Debt and Financing Arrangements - Summary of Recognized Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total interest expense	$ 1,256	$ 1,521	$ 1,587	$ 1,401	$ 1,434	$ 1,614	$ 1,817	$ 1,780	$ 5,765	$ 6,645	$ 6,675
2018 Credit Facility [Member]
Debt Instrument [Line Items]
Total interest expense									5,672	6,509	6,638
Other Line of Credit [Member]
Debt Instrument [Line Items]
Total interest expense									22	1
Other [Member]
Debt Instrument [Line Items]
Total interest expense									$ 71	$ 135	$ 37