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Merger and Acquisition Activities in Prior Years - Additional Information (Detail) (Enfora [Member], USD $)
 9 Months Ended 12 Months Ended 15 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Sep. 30, 2011
Mar. 31, 2011
Nov. 30, 2010
Enfora [Member]
            
Business Acquisition [Line Items]            
Acquisition costs related to the merger of Enfora   $ 1,900,000        
Cash consideration paid in exchange for an agreed upon amount of Enfora working capital   64,500,000        
Additional cash consideration paid in exchange for an agreed upon amount of Enfora working capital   13,000,000        
Additional cash consideration paid based on the operating results of Enfora   6,000,000        
Operating results contingent consideration     15 months      
Fair value of the contingent consideration         0 900,000
Total fair value of consideration transferred   78,400,000        
Changes in the fair value of the contingent consideration 0          
Adjustment to increase Enfora net deferred tax assets       $ 300,000