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Estimated Values of Gross Uncertain Tax Positions (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Beginning Balance $ (351)us-gaap_UnrecognizedTaxBenefits $ (301)us-gaap_UnrecognizedTaxBenefits $ (134)us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year   (31)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions  
Additions for tax positions of prior years (221)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions (164)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions (167)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Settlements   145us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities  
Ending Balance $ (572)us-gaap_UnrecognizedTaxBenefits $ (351)us-gaap_UnrecognizedTaxBenefits $ (301)us-gaap_UnrecognizedTaxBenefits