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Intangible Assets from Acquisitions (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]    
Net $ 31 $ 434
Distribution partner relationship
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 4,830 4,830
Less accumulated amortization (4,799) [1] (4,396) [1]
Net $ 31 $ 434
[1] (1) Excludes the original cost and accumulated amortization of fully-amortized intangible assets which were $87.7 million and $87.6 million at December 31, 2013 and March 31, 2014, respectively.