XML 87 R69.htm IDEA: XBRL DOCUMENT v3.6.0.2
Fair value measurement - Narrative (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
investment
Dec. 31, 2015
USD ($)
Dec. 28, 2014
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Non-cash goodwill impairment charge $ 15,218 $ 8,000 $ 30,300
Hedge funds redemption period 95 days    
Future funding commitments $ 800 1,000  
Hedge funds redemption potential holdback percentage 5.00%    
Hedge funds redemption description Shares in the hedge funds are generally redeemable twice a year or on the last business day of each quarter with at least 60 days written notice subject to potential 5% holdback. There are no unfunded commitments related to the hedge funds.    
Level 1      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Deferred compensation investments $ 28,600 27,800  
Common collective trust - fixed income      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of investments held in collective trusts | investment 10    
Common collective trust - equities      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of investments held in collective trusts | investment 11    
Partnership/joint venture interests      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of investments held in collective trusts | investment 2    
Hedge funds redemption period 30 days    
Redemption fee (as a percent) 0.55%    
Fair value | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt $ 4,190,000 $ 4,310,000