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Goodwill and Intangible Assets Net - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Jun. 30, 2013
Acquired Finite-Lived Intangible Assets [Line Items]      
Disposal or recognition of additional goodwill $ 0 $ 0  
Impairment charges on goodwill   0  
Impairment charges recognized related to the acquired intangible assets 0   0
Annual amortization expense of the intangible assets, 2014 (remaining six months) 0.1 0.1  
Annual amortization expense of the intangible assets, 2015 0.2 0.2  
Annual amortization expense of the intangible assets, 2016 0.2 0.2  
Annual amortization expense of the intangible assets, 2017 0.2 0.2  
Annual amortization expense of the intangible assets, 2018 0.2 0.2  
Annual amortization expense of the intangible assets, 2019 0.2 0.2  
Annual amortization expense of the intangible assets, 2020 $ 0.1 $ 0.1