XML 90 R45.htm IDEA: XBRL DOCUMENT v2.4.0.8
Inventories - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]      
Percentage of material component in inventory 72.00% 72.00% 70.00%
Value of inventory $ 318 $ 318  
Inventories valued at period-end market values $ 303,937 $ 303,937 $ 319,282