XML 15 R55.htm IDEA: XBRL DOCUMENT v2.4.1.9
Goodwill and Other Intangible - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Goodwill And Other Intangible Asset [Line Items]      
Amortization of acquired intangible assets $ 231us-gaap_AmortizationOfIntangibleAssets $ 104us-gaap_AmortizationOfIntangibleAssets $ 108us-gaap_AmortizationOfIntangibleAssets
Amortization expenses of intangible assets, 2015 490us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Amortization expenses of intangible assets, 2016 482us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Amortization expenses of intangible assets, 2017 473us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Amortization expenses of intangible assets, 2018 448us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Amortization expenses of intangible assets, 2019 447us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Amortization expenses of intangible assets, After 2019 $ 667us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Weighted average useful life of intangible assets 7 years 7 months 6 days 13 years 1 month 6 days  
Weighted Average [Member]      
Schedule Of Goodwill And Other Intangible Asset [Line Items]      
Weighted average useful life of intangible assets 7 years 7 months 6 days