Consolidated Quarterly Statements of Operations (Parenthetical) (Detail) (USD $)	3 Months Ended		12 Months Ended			3 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Defined Benefit Pension And Post Retirement Benefit Plans	Dec. 31, 2012 Defined Benefit Pension And Post Retirement Benefit Plans	Jun. 30, 2012 Semiconductor Test Employee	Dec. 31, 2011 Semiconductor Test Employee	Jun. 30, 2012 Litepoint Corporation	Mar. 31, 2012 Litepoint Corporation
Quarterly Financial Information [Line Items]
Proceeds from sale of equity interest	$ 34,200,000
Income tax provision (benefit) errors		200,000	36,975,000	48,927,000	(125,225,000)
Decreased gross profit						2,700,000	(8,100,000)
Decrease in net income						9,100,000	(18,300,000)
Pension settlement charges										(6,500,000)	(1,800,000)
Severance benefit and charges			$ 500,000					$ 300,000	$ 1,200,000
Reduction in employees headcount								10	7