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Commitments and Contingencies - Legal Matters - Additional Information (Detail) (USD $)
 1 Months Ended 6 Months Ended
Jan. 14, 2013
Feb. 15, 2012
Jun. 30, 2013
Oct. 12, 2012
Commitment And Contingencies [Abstract]        
Liability for amount completely withdrawn from the Unions Pension Trust Fund       $ 5,300,000
Reserves for Amount withdrawn from the Union's Pension Trust Fund     0  
Plaintiffs claim to have suffered property damages and other loss     75,000,000  
Reserve recorded under loss contingency     0  
Loss contingency damages sought value from third plaintiffs 1,000,000      
Loss contingency damages sought value from two plaintiffs 5,000,000      
Loss contingency reserve accrual     0  
Company's stock worth   20,500    
Plaintiffs' legal costs   106,000    
Accruals for estimated losses     $ 0  
Assessment regarding Loss contingency impact Description     We are not aware of pending claims or assessments, other than as described above, which may have a material adverse impact on our liquidity, financial position, or results of operations.