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Acquisitions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
May 12, 2011
Dec. 31, 2012
May 30, 2012
Contingency
Business Acquisition [Line Items]      
Business acquisition effective date   May 12, 2011  
Purchase Price   $ 9.0  
Cash paid on acquisition 6.7    
Entity acquisition liability incurred   2.3  
Payment for employee retention and Lease extension   0.9  
Number of contingency provisions elapsed     2
Goodwill deductible for tax purpose   2.1  
Accrued Liabilities [Member]
      
Business Acquisition [Line Items]      
Entity acquisition liability incurred   $ 0.9