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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2015
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Schedule Of Significant Accounting Policies [Line Items]          
Cash, cash equivalents, and restricted cash   $ 94,824,000 $ 139,188,000 $ 171,156,000 $ 100,508,000
Cash and cash equivalents   94,574,000 139,188,000    
Restricted cash   300,000      
Accrued expenses and other current liabilities   130,776,000 103,855,000    
Other long-term liabilities   25,082,000 25,255,000    
Deferred charges and other assets, net   9,782,000 11,074,000    
Long-term debt   $ 68,155,000 75,441,000    
Operating lease expiration year   2032      
Undiscounted future minimum lease payments through 2032   $ 131,800,000      
New England Teamsters & Trucking Industry Pension Fund          
Schedule Of Significant Accounting Policies [Line Items]          
Accrued expenses and other current liabilities   200,000      
Other long-term liabilities   17,400,000      
Significant Other Observable Inputs Level 2 | New England Teamsters & Trucking Industry Pension Fund          
Schedule Of Significant Accounting Policies [Line Items]          
Multiemployer plan discounted withdrawal liability   22,200,000      
Quoted Prices in Active Markets for Identical Assets Level 1          
Schedule Of Significant Accounting Policies [Line Items]          
Investments, debt securities   10,300,000      
Investments, mutual funds   1,400,000      
Accounting Standards Update 2015-03          
Schedule Of Significant Accounting Policies [Line Items]          
Deferred charges and other assets, net     11,100,000    
Long-term debt     75,400,000    
Accounting Standards Update 2015-03 | Scenario, Previously Reported          
Schedule Of Significant Accounting Policies [Line Items]          
Deferred charges and other assets, net     11,900,000    
Long-term debt     $ 76,300,000    
Subsidiaries of Swiss Re          
Schedule Of Significant Accounting Policies [Line Items]          
Derivative maximum payout   12,500,000      
Subsidiaries of Swiss Re | Delivery and branch expenses          
Schedule Of Significant Accounting Policies [Line Items]          
Credit on weather hedge contract $ 12,500,000 $ 0