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Purchase Price Allocation - Isd Corporation (Detail) (ISD Corporation, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]  
Cash $ 2,375
Accounts Receivable 2,030
Other current assets 958
Total current assets acquired 5,363
Property and equipment 519
Goodwill 11,380
Total assets acquired 23,906
Current liabilities acquired (4,681)
Net assets acquired 19,225
Software
  
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]  
Amortizable intangible assets 2,338
Acquired intangible assets, weighted-average useful lives 5 years
Customer relationships
  
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]  
Amortizable intangible assets 4,059
Acquired intangible assets, weighted-average useful lives 9 years
Trade Name
  
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]  
Amortizable intangible assets $ 247
Acquired intangible assets, weighted-average useful lives 5 years