Credit Facilities - Additional Information (Detail) - USD ($) $ in Thousands						9 Months Ended
	Jun. 10, 2021	Feb. 03, 2021	Dec. 31, 2020	Apr. 23, 2020	Jul. 31, 2015	Sep. 30, 2021	Sep. 30, 2020
Line of Credit Facility [Line Items]
Maximum revolving advance amount						$ 50,000
Repayments of long-term lines of credit		$ 42,792				$ 180,745	$ 3,500
Total leverage ratio						4.0
Fixed charge coverage ratio						1.25
Line of Credit [Member]
Line of Credit Facility [Line Items]
Outstanding balance of the revolving loan						$ 7,272
Small Business Administration [Member] | Small Business Administration To Paycheck Protection Program [Member]
Line of Credit Facility [Line Items]
Extinguishment of debt, amount	$ 10,000
Senior Debt Obligations [Member]
Line of Credit Facility [Line Items]
Secured debt		222,500				222,500
Debt issuance costs						$ 1,699
Debt instrument, maturity date						Feb. 03, 2026
Line of credit facility, remaining borrowing capacity						$ 37,500
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Outstanding balance of the revolving loan			$ 42,600
Revolving Credit Facility [Member] | Senior Debt Obligations [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity						73,750
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Outstanding balance of the revolving loan			7,272
Term Facility [Member] | Senior Debt Obligations [Member]
Line of Credit Facility [Line Items]
Line credit facility initial term loan withdrawn at closing date						$ 111,250
Paycheck Protection Program [Member]
Line of Credit Facility [Line Items]
Debt instrument, maturity date				Apr. 24, 2022
Long-term line of credit				$ 10,000
Interest rate during period				1.00%
Term Loan Facility [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum revolving advance amount					$ 142,950
Repayments of long-term lines of credit		$ 137,953
Line of credit facility, remaining borrowing capacity			$ 5,000
Line of credit facility incremental term loan					40,000
Line of credit facility delay drawn term loan					32,950
Line credit facility initial term loan withdrawn at closing date					$ 70,000
Prime Rate [Member]
Line of Credit Facility [Line Items]
Interest charged on outstanding balance, Interest rate						1.25%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Interest charged on outstanding balance, Interest rate						2.25%
London Interbank Offered Rate (LIBOR) [Member] | Senior Debt Obligations [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Interest charged on outstanding balance, Interest rate						2.625%
London Interbank Offered Rate (LIBOR) [Member] | Senior Debt Obligations [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Interest charged on outstanding balance, Interest rate						2.125%
London Interbank Offered Rate (LIBOR) [Member] | Term Facility [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, interest rate description					LIBOR+7.5
London Interbank Offered Rate (LIBOR) [Member] | Term Loan Facility [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt instrument, interest rate during period					1.00%