Debt - Details of Debt (Detail) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Outstanding Debt:
Outstanding Debt		$ 428,442
Unamortized debt issuance costs		(1,094)	$ (1,574)
Outstanding Debt		427,348	460,120
Current portion of long-term debt		61,160	59,713
Long-term debt, net of current portion		366,188	400,407
Term Loan [Member]
Outstanding Debt:
Outstanding Debt		120,000
Revolver [Member]
Outstanding Debt:
Outstanding Debt		163,257
Credit and Security Agreement [Member] | Term Loan [Member]
Outstanding Debt:
Outstanding Debt	[1]	$ 120,000	131,250
Credit facility, Interest Rates	[1]	1.60%
Credit and Security Agreement [Member] | Revolver [Member]
Outstanding Debt:
Outstanding Debt	[1]	$ 163,257	151,326
Credit facility, Interest Rates	[1]	1.60%
Equipment Financing [Member]
Outstanding Debt:
Outstanding Debt	[2]	$ 103,298	129,870
Equipment Financing [Member] | Minimum [Member]
Outstanding Debt:
Credit facility, Interest Rates	[2]	2.25%
Equipment Financing [Member] | Maximum [Member]
Outstanding Debt:
Credit facility, Interest Rates	[2]	5.13%
Real Estate Financing [Member]
Outstanding Debt:
Outstanding Debt	[3]	$ 41,887	$ 49,248
Real Estate Financing [Member] | Minimum [Member]
Outstanding Debt:
Credit facility, Interest Rates	[3]	1.95%
Real Estate Financing [Member] | Maximum [Member]
Outstanding Debt:
Credit facility, Interest Rates	[3]	2.35%
Margin Facility [Member]
Outstanding Debt:
Credit facility, Interest Rates	[4]	1.20%

[1] Our Credit and Security Agreement (the “Credit Agreement”) provides for maximum borrowings of $350 million in the form of a $150 million term loan and a $200 million revolver.  Term loan proceeds were advanced on November 27, 2018 and mature on November 26, 2023.  The term loan will be repaid in consecutive quarterly installments, as defined in the Credit Agreement, commencing March 31, 2019, with the remaining balance due at maturity.  Borrowings under the revolving credit facility may be made until and mature on November 26, 2023. Borrowings under the Credit Agreement bear interest at LIBOR or a base rate plus an applicable margin for each based the Company’s leverage ratio.  The Credit Agreement is secured by a first priority pledge of the capital stock of applicable subsidiaries, as well as first priority perfected security interest in cash, deposits, accounts receivable, and selected other assets of the applicable borrowers.  The Credit Agreement includes customary affirmative and negative covenants and events of default, as well as financial covenants requiring minimum fixed charge coverage and leverage ratios, and customary mandatory prepayments provisions. At December 31, 2021, we were in compliance with all covenants under the facility, and $36.7 million was available for borrowing on the revolver.

[2] Our Equipment Financing consists of a series of promissory notes issued by a wholly owned subsidiary. The equipment notes, which are secured by liens on specific titled vehicles, include certain affirmative and negative covenants, are generally payable in 60 monthly installments and bear interest at fixed rates ranging from 2.25% to 5.13%.

[3] Our Real Estate Financing consists of a series of promissory notes issued by a wholly owned subsidiary. The promissory notes, which are secured by first mortgages and assignment of leases on specific parcels of real estate and improvements, include certain affirmative and negative covenants and are generally payable in 120 monthly installments.  Each of the notes bears interest at a variable rate ranging from LIBOR plus 1.85% to LIBOR plus 2.25%. At December 31, 2021, we were in compliance with all covenants.

[4] Our Margin Facility is a short-term line of credit secured by our portfolio of marketable securities. It bears interest at LIBOR plus 1.10%. The amount available under the line of credit is based on a percentage of the market value of the underlying securities. At December 31, 2021, the maximum available borrowings under the line of credit were $4.3 million.