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Derivatives - Fair Value of Derivative Contracts (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  | $ 24,745 | $ 12,669
Derivative contracts, Liabilities |  | 13,153 | 7,933
Notional Amounts | [1] | 15,795,474 | 17,669,642
Foreign Exchange/Commodities Options [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  | 3,931 | 4,416
Derivative contracts, Liabilities |  |  | 130
Notional Amounts | [1] | 3,059,888 | 2,442,200
Futures [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  | 1,233 | 25
Derivative contracts, Liabilities |  | 810 | 1,066
Notional Amounts | [1] | 10,453,750 | 13,023,030
Foreign Exchange Swaps [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  | 943 | 801
Derivative contracts, Liabilities |  | 727 | 2,846
Notional Amounts | [1] | 472,287 | 407,600
Interest Rate Swaps [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  |  | 242
Notional Amounts | [1] |  | 12,092
Equity Options [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Liabilities |  |  | 18
Notional Amounts | [1] |  | 961,000
Forwards [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  | 9,888 | 4,262
Derivative contracts, Liabilities |  | 2,636 | 1,483
Notional Amounts | [1] | 1,435,352 | 642,802
Rate Lock Commitments [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative contracts, Assets |  | 8,750 | 2,923
Derivative contracts, Liabilities |  | 8,980 | 2,390
Notional Amounts | [1] | $ 374,197 | $ 180,918
[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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84234895&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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