Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Detail) $ in Thousands, € in Millions	12 Months Ended
Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)
U.S. Dollar-denominated interest rate swaps 1 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 2,974,274
Fair Value / Carrying Amount of Asset / (Liability)	$ (243,261)
Weighted- Average Remaining Term (years)	5 years 4 months 24 days
Fixed Interest Rate	3.30%	3.30%
U.S. Dollar-denominated interest rate swaps 2 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 517,629
Fair Value / Carrying Amount of Asset / (Liability)	$ (16,489)
Weighted- Average Remaining Term (years)	4 years 2 months 12 days
Fixed Interest Rate	3.00%	3.00%
U.S. Dollar-denominated interest rate swaption [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 155,000
Fair Value / Carrying Amount of Asset / (Liability)	$ (1,525)
Weighted- Average Remaining Term (years)	3 months 18 days
Fixed Interest Rate	2.20%	2.20%
United States Dollar Denominated Interest Rate Swaption One [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 155,000
Fair Value / Carrying Amount of Asset / (Liability)	$ 31
Weighted- Average Remaining Term (years)	3 months 18 days
Fixed Interest Rate	3.30%	3.30%
United States Dollar Denominated Interest Rate Swaption Two [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 160,000
Fair Value / Carrying Amount of Asset / (Liability)	$ (1,457)
Weighted- Average Remaining Term (years)	1 year 1 month 6 days
Fixed Interest Rate	2.00%	2.00%
United States Dollar Denominated Interest Rate Swaption Three [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 160,000
Fair Value / Carrying Amount of Asset / (Liability)	$ 1,140
Weighted- Average Remaining Term (years)	1 year 1 month 6 days
Fixed Interest Rate	3.10%	3.10%
United States Dollar Denominated Interest Rate Swaption Five [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 160,000
Fair Value / Carrying Amount of Asset / (Liability)	$ (1,248)
Weighted- Average Remaining Term (years)	1 year 6 months
Fixed Interest Rate	1.80%	1.80%
United States Dollar Denominated Interest Rate Swaption Four [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 160,000
Fair Value / Carrying Amount of Asset / (Liability)	$ 2,112
Weighted- Average Remaining Term (years)	1 year 6 months
Fixed Interest Rate	2.90%	2.90%
Euro-denominated interest rate swaps [Member]
Derivative [Line Items]
Principal Amount \| €		€ 208.9
Euro-denominated interest rate swaps [Member] \| Euro Interbank Offered Rate Euribor [Member]
Derivative [Line Items]
Principal Amount	$ 219,733
Fair Value / Carrying Amount of Asset / (Liability)	$ (34,295)
Weighted- Average Remaining Term (years)	4 years
Fixed Interest Rate	3.10%	3.10%
Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (294,992)

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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