Reportable Segments and Related Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Number of reportable segments	1
Texas NICUSA, LLC
Segment Reporting Information [Line Items]
Percentage of total revenues	21.00%	21.00%	22.00%
Data Resellers
Segment Reporting Information [Line Items]
Percentage of total revenues	26.00%	28.00%	27.00%
Percentage of accounts receivable	21.00%	22.00%
Outsourced Portals - DMV Transaction - Based
Segment Reporting Information [Line Items]
Percentage of total revenues	34.00%	36.00%	39.00%
Motor Vehicle Registration And Licensing
Segment Reporting Information [Line Items]
Percentage of total revenues	10.00%