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New Accounting Pronouncements - Schedule of Impact of Adoption of New Revenue Standard on Consolidated Balance Sheet Line Items (Detail) - USD ($)
Dec. 31, 2018
Oct. 01, 2018
Sep. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Inventories, net $ 445,465,000   $ 377,074,000
Prepaid expenses and other current assets 10,904,000   5,392,000
Deferred tax assets, net 2,588,000   3,408,000
Accounts payable 11,840,000   23,134,000
Accrued expenses 29,790,000   32,926,000
Retained earnings 171,380,000   $ 166,071,000
Balances without adoption of ASC Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Inventories, net 446,228,000    
Prepaid expenses and other current assets 6,940,000    
Deferred tax assets, net 2,725,000    
Accounts payable 11,703,000    
Accrued expenses 27,725,000    
Retained earnings 170,518,000    
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Inventories, net (763,000)    
Prepaid expenses and other current assets 3,964,000    
Deferred tax assets, net (137,000)    
Accounts payable 137,000    
Accrued expenses 2,065,000    
Retained earnings $ 862,000 $ 399,000