Acquisitions - Additional Information (Detail) (Bold [Member], USD $)	1 Months Ended	3 Months Ended	6 Months Ended		1 Months Ended
	Jan. 06, 2012	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jul. 15, 2013 Subsequent Event [Member]
Business Acquisition [Line Items]
Initial cash payment	$ 15,300,000
Contingent payments	1,500,000				888,000
Maturity period for contingent payment			2 years
Range of contingent payments, Minimum			0
Range of contingent payments, Maximum			1,500,000
Actual contingent payment paid					594,000
Acquisition-related costs		$ 100,000		$ 100,000