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