Fair Value Information - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value assets transfers from Level 1 to Level 2	0	$ 0
Fair value assets transfers from Level 2 to Level 1	0	0
Fair value assets transfers from Level 2 to Level 3	0	0
Fair value assets transfers from Level 3 to Level 2	0	0
Fair value assets transfers from Level 1 to Level 3	0	0
Fair value assets transfers from Level 3 to Level 1	0	$ 0
Minimum [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Term of interest rate swap contracts by the counterparty, years	3 years
Maximum [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Term of interest rate swap contracts by the counterparty, years	30 years

Fair value asset level one to level three transfers amount.

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- Definition

Fair value assets level three to level one transfers amount.

+ References

No definition available.

+ Details

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- Definition

Fair value assets level three to level two transfers amount.

+ References

No definition available.

+ Details

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- Definition

Fair value assets level two to level three transfers amount.

+ References

No definition available.

+ Details

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- Definition

Term of interest rate swap contracts by counter party.

+ References

No definition available.

+ Details

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

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