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Derivatives - Fair Value of Derivative Contracts (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 13, 2018
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  | $ 2,953 | $ 1,979
Derivative contracts, Liabilities |  | 2,536 | 91,129
Notional Amounts | [1] | 14,148,301 | 18,374,656
Foreign Exchange Swaps [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  | 2,594 | 1,611
Derivative contracts, Liabilities |  | 2,092 | 2,072
Notional Amounts | [1] | 1,001,289 | 482,295
Foreign Exchange/Commodities Options [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  |  | 39
Derivative contracts, Liabilities |  | 42 | 88,016
Notional Amounts | [1] | 4,557 | 4,745,428
Forwards [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  | 28 | 236
Derivative contracts, Liabilities |  | 171 | 639
Notional Amounts | [1] | 93,470 | 79,008
Futures [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  | 331 | 93
Derivative contracts, Liabilities |  | 231 | 402
Notional Amounts | [1] | $ 13,048,985 | $ 13,067,925
[1] | Notional amounts represent the sum of gross long and short derivative contracts, an indication of the volume of the Company’s derivative activity and does not represent anticipated losses.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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