THE COMPANY - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2011
Nature of Operations [Line Items]
Number of business channels	2
US Department of Transportation, Federal Motor Carrier Safety Administration
Nature of Operations [Line Items]
PSP commencement	The PSP commenced operations in the second quarter of 2010.
Contract Expiration Date	Feb. 16, 2011
US Department of Transportation, Federal Motor Carrier Safety Administration | Renewal Term
Nature of Operations [Line Items]
Number of contract renewal options	4
Term of contract	1 year
US Department of Transportation, Federal Motor Carrier Safety Administration | Extended Term
Nature of Operations [Line Items]
Term of contract	1 year
US Department of Transportation, Federal Motor Carrier Safety Administration | Subsequent Event
Nature of Operations [Line Items]
Subsequent event description	During the first quarter of 2012, the FMCSA approved its second one-year contract extension through February 16, 2013.
Contract Expiration Date	Feb. 16, 2013
Federal Election Commission
Nature of Operations [Line Items]
Contract Expiration Date	Jun. 30, 2012
State Of Michigan
Nature of Operations [Line Items]
Contract Expiration Date	Dec. 31, 2012