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Equity Method Investments (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
WesPac
item
Dec. 31, 2011
WesPac
item
Jul. 01, 2010
WesPac
Jul. 01, 2010
WesPac
Kealine
Dec. 31, 2012
Bernard
Dec. 31, 2011
Bernard
Dec. 31, 2009
Bernard
Dec. 31, 2012
Alvah, Inc.
Nov. 17, 2012
Alvah, Inc.
Dec. 31, 2012
Alvah, Inc.
ARB
Dec. 31, 2012
Alvah, Inc.
Q3C
Equity method investments                            
Membership interest (as a percent)           50.00% 50.00%     30.00%   49.00%    
Balance sheet data                            
Assets       $ 16,896 $ 20,147     $ 592 $ 5,677          
Liabilities       1,063 1,820     86 4,771          
Net assets       15,833 18,327     506 906          
Company's equity investment 12,813 12,687   11,463 12,415     150 272          
Earnings data:                            
Revenue       552 1,717     4,026 72,822          
Expenses       2,455 9,303     227 39,650          
Earnings before taxes       (1,903) (7,586)     3,799 33,172          
Company's equity in earnings 186 4,018 4,630 (952) (3,793)     1,138 9,415          
Number of potential projects terminated by major oil refining third party         2                  
Amount expensed       1,100 5,400                  
Number of projects abandoned       3                    
Share of expenses recorded by the entity (as a percent)       50.00% 50.00%                  
Reduction recorded to recognize an estimate for an other than temporary decrease         1,700                  
Basis difference between the entity's original investment and its pro-rata share of the investee equity prior to any impairment adjustment         5,000                  
Amount distributed               4,200 36,955   200      
Share in distribution 1,358 10,136 9,491         1,260 10,022   98      
Subcontractor payments made to equity method investee                         $ 6,377 $ 537