The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
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The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

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Amount of gain (loss) from the increase (decrease) in fair value of foreign currency derivatives and nonderivative instruments designated as fair value hedging instruments which were recognized in earnings, net of offsets by the gain (loss) on the hedged item to the extent that the fair value hedge was determined to be effective.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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Amount, after tax, of cumulative translation adjustment attributable to gain (loss) on foreign currency derivatives that are designated as, and are effective as, economic hedges of a net investment in a foreign entity.

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Derivatives and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Derivative [Line Items]
Foreign currency translation adjustment (CTA) gain (loss)	$ 145,851	$ 106,938
Losses reclassified from AOCI into income, effective portion	18,400	9,000
Gains reclassified from AOCI into income, effective portion	9,300	17,700
Designated as hedging instruments [Member]
Derivative [Line Items]
Total principal amount of foreign currency loans designated as net investment hedges	4,102,700		$ 3,149,500
Foreign currency translation adjustment (CTA) gain (loss)	$ (74,300)	(28,600)
Not designated as hedging instruments [Member] \| Embedded derivatives [Member]
Derivative [Line Items]
Net gains (losses) on embedded derivatives		(5,000)
Not designated as hedging instruments [Member] \| Foreign currency forward contracts designated as cash flow hedges
Derivative [Line Items]
Net gain (loss) in foreign currency forward and options contracts		$ 14,700