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Fair Value Measurement - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets fair value disclosure nonrecurring basis	$ 0us-gaap_AssetsFairValueDisclosureNonrecurring	$ 0us-gaap_AssetsFairValueDisclosureNonrecurring	$ 0us-gaap_AssetsFairValueDisclosureNonrecurring
Assets measured at fair value nonrecurring basis, loss incurred	$ 0us-gaap_AssetsFairValueAdjustment	$ 0us-gaap_AssetsFairValueAdjustment	$ 0us-gaap_AssetsFairValueAdjustment

X

- Definition

Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant