XML 49 R43.htm IDEA: XBRL DOCUMENT v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2013
Customer
Segment
Pension_Plan
Dec. 31, 2012
Customer
Dec. 30, 2013
Permalok Corporation [Member]
Dec. 31, 2013
Permalok Corporation [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Minimum [Member]
Permalok Corporation [Member]
Dec. 31, 2013
Minimum [Member]
Land Improvements [Member]
Dec. 31, 2013
Minimum [Member]
Buildings [Member]
Dec. 31, 2013
Minimum [Member]
Machinery and Equipment [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Maximum [Member]
Permalok Corporation [Member]
Dec. 31, 2013
Maximum [Member]
Land Improvements [Member]
Dec. 31, 2013
Maximum [Member]
Buildings [Member]
Dec. 31, 2013
Maximum [Member]
Machinery and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]                              
Number of reportable segments   2                          
Carrying value of investment   $ 0 $ 0                        
Business acquisition date         Dec. 30, 2013                    
Business acquisition, percentage       100.00%                      
Business acquisition (net of received), amount paid   15,689,000     15,700,000                    
Business acquisition, goodwill   5,282,000   5,300,000                      
Business acquisition, contingent consideration recorded         4,400,000   300,000         5,200,000      
Proceeds from sale of traffic systems assets 13,700,000                            
Gain on sale of traffic systems assets 2,900,000                            
Goodwill written off related to sale of traffic systems assets 973,000                            
Advanced deposits   $ 0 $ 9,400,000                        
Estimated useful lives of property and equipment               15 years 20 years 3 years     30 years 40 years 30 years
Estimated useful lives of intangible assets   9 years 7 months 6 days       3 years         15 years        
Number of defined benefit pension plans   2                          
Change in gross profit which triggers senior management review   2.00%                          
Minimum likelihood of tax benefit being realized in order for tax benefit to be recorded   50.00%                          
Number of customers with balances in excess of 10% of total accounts receivable   2 0