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Derivatives - Fair Value of Derivative Contracts (Detail) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
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.

X

- 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

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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

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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

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