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Credit and Other Debt Agreements - Credit Agreement - Additional Information (Detail)
NZD in Millions, AUD in Millions
 12 Months Ended
Apr. 08, 2016
USD ($)
Institution
Dec. 31, 2017
USD ($)
Dec. 31, 2017
NZD
Dec. 31, 2017
AUD
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
NZD
Dec. 31, 2017
AUD
Debt Instrument [Line Items]                
Liabilities   $ 8,732,500,000     $ 7,833,800,000      
Line of credit facility, increase in additional borrowings   3,643,000,000     $ 2,740,000,000 $ 849,000,000    
Long-term debt   $ 19,700,000            
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Date of expire   May 18, 2019 May 18, 2019 May 18, 2019        
Interest rate for facility   The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.05%. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.55%. The annual fee for Facility B is 0.4725% of the undrawn commitments for the two tranches of the facility. The annual fee for Facilities C and D is 0.50% of the total commitments of the facilities. The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.05%. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.55%. The annual fee for Facility B is 0.4725% of the undrawn commitments for the two tranches of the facility. The annual fee for Facilities C and D is 0.50% of the total commitments of the facilities. The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.05%. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.55%. The annual fee for Facility B is 0.4725% of the undrawn commitments for the two tranches of the facility. The annual fee for Facilities C and D is 0.50% of the total commitments of the facilities.        
Debt instrument fair value amount   $ 151,100,000            
Credit Facility Two [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Line of credit facility, amount outstanding             NZD 8.0 AUD 150.0
Line of credit facility, remaining borrowing capacity             17.0 10.0
Net borrowings on premium financing debt facility     NZD 25.0 AUD 160.0        
Additional margin percentage on interest rate   1.05% 1.05% 1.05%        
Annual fee percentage   0.4725% 0.4725% 0.4725%        
Credit Facility Three [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Line of credit facility, amount outstanding | AUD               23.9
Line of credit facility, remaining borrowing capacity             0.1 1.1
Net borrowings on premium financing debt facility | AUD       AUD 25.0        
Additional margin percentage on interest rate   0.55% 0.55% 0.55%        
Annual fee percentage   0.50% 0.50% 0.50%        
Credit Facility Four [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Line of credit facility, amount outstanding | NZD             14.9  
Line of credit facility, remaining borrowing capacity             NZD 0.1 AUD 1.1
Net borrowings on premium financing debt facility | NZD     NZD 15.0          
Additional margin percentage on interest rate   0.55% 0.55% 0.55%        
Annual fee percentage   0.50% 0.50% 0.50%        
Multi Currency Credit Agreement [Member]                
Debt Instrument [Line Items]                
Number of financial institutions entered in unsecured multicurrency credit agreement | Institution 15              
Line of credit facility, maximum amount outstanding during period   $ 1,100,000,000            
Debt acquisition costs   2,000,000            
Estimated fair value of outstanding borrowings   $ 190,000,000            
Multi Currency Credit Agreement [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Debt instrument, maturity date Sep. 19, 2018              
Line of credit facility, maximum borrowing capacity $ 600,000,000              
Interest rates on base rate loans   0.00% 0.00% 0.00%        
Fixed rate over LIBOR   0.85% 0.85% 0.85%        
Annual facility fee of revolving credit facility   0.15% 0.15% 0.15%        
Multi Currency Credit Agreement [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Debt instrument, maturity date Apr. 08, 2021              
Line of credit facility, maximum borrowing capacity $ 800,000,000              
Interest rates on base rate loans   0.45% 0.45% 0.45%        
Fixed rate over LIBOR   1.45% 1.45% 1.45%        
Annual facility fee of revolving credit facility   0.30% 0.30% 0.30%        
Multi Currency Credit Agreement [Member] | Swing Loan [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross   $ 75,000,000            
Multi Currency Credit Agreement [Member] | Standby Letters of Credit [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross   75,000,000            
Line of credit facility, amount outstanding   17,200,000            
Liabilities   13,500,000            
Line of credit facility, fair value of amount outstanding   190,000,000            
Line of credit facility, remaining borrowing capacity   592,800,000            
Line of credit facility, increase in additional borrowings   57,800,000            
Note Purchase Agreements [Member] | Level 3 [Member]                
Debt Instrument [Line Items]                
Line of credit facility, fair value of amount outstanding   2,920,700,000            
Long-term debt   $ 2,798,000,000