Quarterly report pursuant to Section 13 or 15(d)

Business Acquisition - Additional Information (Detail)

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Business Acquisition - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 15, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
May 15, 2017
Business Acquisition [Line Items]              
Purchase price of business acquired settled in cash       $ 51,319      
Goodwill recognized in connection with the acquisition   $ 34,398   34,398   $ 30,600  
Revenues   195,075 $ 148,099 464,395 $ 380,585    
Net income   13,403 6,412 35,647 13,773    
General and administrative expenses   14,788 $ 12,477 40,572 $ 34,005    
Scruggs Company [Member]              
Business Acquisition [Line Items]              
Acuisition of common shares and voting interest 100.00%            
Purchase price of business acquired settled in cash $ 51,300            
Goodwill recognized in connection with the acquisition 3,800           $ 3,798
Revenues   11,400   11,400      
Net income   1,000   1,000      
General and administrative expenses   200   200      
Acquisition-related expenses excluded from pro forma   $ 200   200      
Scruggs Company [Member] | Compass Term Loan [Member]              
Business Acquisition [Line Items]              
Funding of purchase price through borrowed term loan $ 22,000            
Scruggs Company [Member] | Term A Loan Facility [Member]              
Business Acquisition [Line Items]              
Funding of purchase price through borrowed term loan       $ 22,000