Supplemental Disclosure of Noncash Investing and Financing Activities - Supplemental Disclosure of Noncash Investing and Financing Activities (Parenthetical) (Detail) (StarTrak [Member])	12 Months Ended
	Dec. 31, 2013
StarTrak [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Promissory note, Interest percentage	6.00%