XML 63 R46.htm IDEA: XBRL DOCUMENT v3.5.0.2
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Schedule Of Significant Accounting Policies [Line Items]        
Advertising and direct mail expenses   $ 14,900,000 $ 14,500,000 $ 12,500,000
Deferred tax assets, net   5,353,000 16,308,000  
Accounting Standards Update 2015-17        
Schedule Of Significant Accounting Policies [Line Items]        
Current deferred tax assets, net   0    
Long-term deferred tax liabilities, net   0    
Deferred tax assets, net   16,300,000    
Accounting Standards Update 2015-17 | Scenario, Previously Reported        
Schedule Of Significant Accounting Policies [Line Items]        
Current deferred tax assets, net   37,800,000    
Long-term deferred tax liabilities, net   21,500,000    
Deferred tax assets, net   0    
Subsidiaries of Swiss Re        
Schedule Of Significant Accounting Policies [Line Items]        
Weather hedge contract, payment entitled to be received per heating degree-day shortfall   $ 35,000 $ 35,000 $ 35,000
Percentage in heating degree days less than ten year average that is covered   92.50%    
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      
Maximum        
Schedule Of Significant Accounting Policies [Line Items]        
Cash equivalents, highly liquid investments maturity   3 months    
Maximum | Customer Lists        
Schedule Of Significant Accounting Policies [Line Items]        
Intangible assets, amortization period   10 years    
Maximum | Trade Names        
Schedule Of Significant Accounting Policies [Line Items]        
Intangible assets, amortization period   20 years    
Minimum | Customer Lists        
Schedule Of Significant Accounting Policies [Line Items]        
Intangible assets, amortization period   7 years    
Minimum | Trade Names        
Schedule Of Significant Accounting Policies [Line Items]        
Intangible assets, amortization period   7 years