Annual report pursuant to Section 13 and 15(d)

Goodwill - Additional Information (Detail)

v2.4.0.8
Goodwill - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended
Nov. 01, 2013
Reporting_Unit
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Goodwill [Line Items]          
Number of reportable units 6        
Goodwill impairment charge   $ 0 $ 0 $ 2,400,000 $ 0
Goodwill   100,998,000 21,923,000 17,185,000  
Test Systems [Member]
         
Goodwill [Line Items]          
Goodwill   $ 0 $ 0