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Credit Facility - Additional Information (Detail) - Revolving Credit Facility [Member] - USD ($)
Sep. 26, 2019
Feb. 07, 2008
Debt Instrument [Line Items]    
Revolving loan commitment and letter of credit sub facility   $ 117,500,000
Available credit under the Credit Facility $ 97,508,000  
Outstanding letters of credit 3,950,000  
Revolving credit facility borrowings $ 16,042,000