REVENUE RECOGNITION - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013
Minimum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Maintenance contract term	3 years
System installation period	21 days
Maximum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Maintenance contract term	5 years
System installation period	28 days