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Commitments and Contingencies - Additional Information (Detail) (USD $)
 1 Months Ended 6 Months Ended
Jun. 30, 2007
Jun. 30, 2014
Parties
Jun. 30, 2014
Portland Harbor Natural Resources Trustee Council [Member]
Jun. 30, 2014
Minimum [Member]
Jun. 30, 2014
Maximum [Member]
Other Commitments [Line Items]          
Company made payment to Lower Willamette Group as interim settlement $ 175,000        
Estimated cost       169,000,000 1,760,000,000
Estimated years to implement       2 years 28 years
Amount anticipated to spent for further Source Control work   100,000      
Accrued funding for injury assessment process     360,000    
Number of potentially responsible parties   100      
Total stand-by letters of credit   $ 3,100,000