XML 33 R32.htm IDEA: XBRL DOCUMENT v2.4.0.8
Investments - Summary of Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investments Schedule [Abstract]    
Marketable securities $ 50,845 $ 28,968
Equity method investments 7,235 4,070
Nonqualified retirement plan assets 4,654 4,220
Other investments 925  
Total investments $ 63,659 $ 37,258