Prepaid Expenses and Other Current Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Prepaid Expenses And Other Current Assets
Deferred commission costs	$ 6,122	$ 4,602
Prepaid taxes	2,438	1,962
Rebate receivable	1,096	766
Prepaid insurance	571	229
Capitalized costs of in-vehicle devices owned by customers	861	595
Prepaid subscription service fees	529	478
Prepaid software license fees and support	528	382
Other	1,530	1,357
Total	$ 13,675	$ 10,371