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Debt - Summary of Outstanding Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Foreign subsidiary lines of credit |  | $ 178 | $ 273
Total notes payable and debt, current |  | 178 | 100,273
Unamortized debt issuance costs |  | (1,828) | (2,499)
Long-term debt |  | 1,148,172 | 1,897,501
Total debt |  | 1,148,350 | 1,997,774
Senior Unsecured Notes Series D [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total notes payable and debt, current |  |  | 100,000
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
Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt |  | $ 590,000 | $ 1,300,000
[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%.

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