XML 22 R53.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value Measurement - Additional Information (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets reported at fair value on a non-recurring basis $ 0us-gaap_AssetsFairValueDisclosureNonrecurring $ 0us-gaap_AssetsFairValueDisclosureNonrecurring
Liabilities reported at fair value on a non-recurring basis $ 0us-gaap_LiabilitiesFairValueDisclosureNonrecurring $ 0us-gaap_LiabilitiesFairValueDisclosureNonrecurring