Operating Segment, Geographic Information and Significant Customers - Additional Information (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2013 segment	Jun. 30, 2013 revenue_programs	Jun. 30, 2011 revenue_programs	Jun. 30, 2012 AEGIS Program
Segment Reporting [Abstract]
Number of operating segments	3
Segment Reporting Information [Line Items]
Percentage of revenue contributed from a single program				11.00%
Number of program comprised 10% or more of company's revenue		0	0