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Debt - Summary of Outstanding Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Foreign subsidiary lines of credit $ 499 $ 273
Total notes payable and debt, current 499 100,273
Unamortized debt issuance costs (2,049) (2,499)
Long-term debt 1,147,951 1,897,501
Total debt 1,148,450 1,997,774
Senior Unsecured Notes Series D [Member]    
Debt Instrument [Line Items]    
Total notes payable and debt, current   100,000
Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt 590,000 1,300,000
Senior Unsecured Notes Series B [Member]    
Debt Instrument [Line Items]    
Long-term debt 100,000 100,000
Senior Unsecured Notes Series E [Member]    
Debt Instrument [Line Items]    
Long-term debt 50,000 50,000
Senior Unsecured Notes Series F [Member]    
Debt Instrument [Line Items]    
Long-term debt 100,000 100,000
Senior Unsecured Notes Series G [Member]    
Debt Instrument [Line Items]    
Long-term debt 50,000 50,000
Senior Unsecured Notes Series H [Member]    
Debt Instrument [Line Items]    
Long-term debt [1] 50,000 50,000
Senior Unsecured Notes Series I [Member]    
Debt Instrument [Line Items]    
Long-term debt 50,000 50,000
Senior Unsecured Notes Series J [Member]    
Debt Instrument [Line Items]    
Long-term debt [2]   40,000
Senior Unsecured Notes Series K [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 160,000 $ 160,000
[1] Series H senior unsecured notes bear interest at a 3-month LIBOR for that floating rate interest period plus 1.25%.
[2] Series J senior unsecured notes bore interest at a 3-month LIBOR for that floating rate interest period plus 1.45%.