Long-Term Debt - Additional Information (Detail)		3 Months Ended	12 Months Ended
	Oct. 25, 2019 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 EUR (€)	Apr. 30, 2020 USD ($)	Aug. 31, 2015 USD ($)
Debt Instrument [Line Items]
Repayment of borrowings			$ 100,000,000
Debt issuance costs paid			1,537,000	$ 3,021,000	$ 682,000
Cash paid to interest			1,900,000	800,000	800,000
Italy [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			6,700,000	6,200,000		€ 5,500,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount outstanding under lines of credit							$ 100,000,000.0
Repayment of borrowings		$ 100,000,000.0
Amended Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300,000,000
Credit agreement maturity date	Oct. 25, 2024
Amount outstanding under lines of credit			0	0
Maximum borrowing capacity available for issuance of letters of credit	$ 50,000,000
Maximum additional borrowing capacity	$ 150,000,000
Line of credit facility, percentage of maximum incremental amount on consolidated EBITDA	350.00%
Borrowers ability to increase amount of line of credit facility, Description	The Borrowers have the ability to increase the amount of the Facility, which increases may take the form of increases to the revolving credit commitments or the issuance of new term A loans, by an aggregate amount of up to the greater of $150 million or an incremental amount such that the total amount of the Facility does not exceed 350% of consolidated EBITDA of the Company (as determined for the four fiscal quarter period most recently ended for which financial statements are available), upon satisfaction of customary conditions precedent for such increases or incremental loans and receipt of additional commitments by one or more existing or new lenders.
Line of credit, leverage ratio	3.5
Line of credit, interest coverage ratio	300.00%
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity available for working capital and other general corporate purposes	$ 150,000,000
Line of credit facility, unused commitment fee percentage	0.25%
Line of credit, leverage ratio	4.0
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Margin on variable rate	2.25%
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Margin on variable rate	1.25%
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Line of credit facility, unused commitment fee percentage	0.15%
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Margin on variable rate	1.25%
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Margin on variable rate	0.25%
2015 Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			125,000,000
Debt issuance costs paid			1,500,000
Debt issuance costs capitalized								$ 1,800,000
Debt issuance costs, net of accumulated amortization			1,400,000	1,700,000
Debt issuance costs amortized or expensed			$ 400,000	$ 400,000	$ 400,000