Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Billions	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Derivative Collateral
Derivatives, Fair Value [Line Items]
Derivative liability fair value of collateral	$ 0.2	$ 0.2	$ 0.6
Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Notional amount	1.8	1.8	1.8
Forward Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Notional amount	2.0	2.0	2.0
Fair value of notional amount	0.2	0.2	0.2
Cross Currency Swaps
Derivatives, Fair Value [Line Items]
Notional amount	10.3	10.3	10.3
Fair value of cross currency swaps	1.3	1.3	$ 0.6
Pre-tax gain (loss) recognized in other comprehensive loss	$ 0.2	$ (0.7)

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

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4D

-Subparagraph (c)(2)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Fair value of securities pledged as collateral against derivative liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

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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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- Definition

Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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