Subsequent Events - Additional Information (Detail) (USD $)		3 Months Ended	1 Months Ended
	Dec. 31, 2012	Dec. 31, 2013 Scenario, Forecast	Nov. 01, 2013 Subsequent Event	Oct. 25, 2013 Subsequent Event ZTEC	Oct. 25, 2013 Subsequent Event ZTEC Maximum
Subsequent Event [Line Items]
Acquisition price				$ 15,000,000
Amount payable upon completion of performance target	388,000				5,000,000
Proceeds from sale of equity interest			34,200,000
Additional proceeds held in escrow			5,200,000
Amount of gain will record		$ 34,200,000