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Employee Retirement Plans - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2014
Union Steelworkers [Member]
Mar. 31, 2014
Union Steelworkers [Member]
Jun. 30, 2014
Union Steelworkers [Member]
April 1, 2014 and beyond [Member]
Jun. 30, 2014
Schuff [Member]
California Ironworkers Field Pension Trust [Member]
Jun. 30, 2014
Schuff [Member]
California Ironworkers Field Pension Trust [Member]
Maximum [Member]
Jun. 30, 2014
Schuff [Member]
Steelworkers Pension Trust [Member]
Dec. 30, 2012
Schuff [Member]
Steelworkers Pension Trust [Member]
Dec. 31, 2013
Schuff [Member]
Steelworkers Pension Trust [Member]
Mar. 31, 2012
Schuff [Member]
Steelworkers Pension Trust [Member]
Jun. 30, 2014
Schuff [Member]
Union Steelworkers [Member]
Defined Benefit Plan Disclosure [Line Items]                    
Pension withdrawal liability           $ 1,000,000   $ 2,400,000 $ 2,600,000  
Defined benefit pension plan contribution made by employer $ 11,000     $ 900,000   $ 200,000 $ 200,000      
Percentage of employees covered under plan         5.00%          
Discretionary matching contributions vested percentage 100.00%                 100.00%
Profit share contributions, probationary period 640 hours                  
Discretionary matching contributions vested period 3 years                  
Profit share contributions rate for each hour   0.50 0.55