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Construction Services Redeemable Noncontrolling Interest (Tables)
3 Months Ended
Mar. 31, 2015
Noncontrolling Interest [Abstract]  
Summary of Redeemable Noncontrolling Interest
     Redeemable
Noncontrolling
Interest
 
(Thousands of dollars):       

Balance, December 31, 2014

   $ 20,042   

Net income (loss) attributable to redeemable noncontrolling interest

     (245

Foreign currency exchange translation adjustment

     (43

Adjustment to redemption value

     (658
  

 

 

 

Balance, March 31, 2015

$ 19,096