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Step Acquisition (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
company
Sep. 28, 2013
Mar. 29, 2014
Spanish companies
Jun. 28, 2014
Spanish companies
Sep. 27, 2014
Spanish companies
company
Spanish companies              
Number of Spanish companies     2       2
Ownership interest in Spanish companies (as a percent)         50.00% 75.00%  
Net loss related to acquired companies         $ 529    
Income Tax Expense (Benefit) 10,316 10,549 21,958 17,509 2,350    
Purchase of capital stock           $ 736