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Intangible Assets Other Than Goodwill - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]        
Amortization expense $ 2.2 $ 1.7 $ 3.6 $ 2.4