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Commitments and Contingencies - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Jun. 30, 2007
Dec. 31, 2013
Parties
Dec. 31, 2013
Portland Harbor Natural Resources Trustee Council [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Other Commitments [Line Items]          
Company made payment to Lower Willamette Group as interim settlement $ 175,000        
Liability to pay 0   0    
Estimated cost       169,000,000 1,760,000,000
Estimated years to implement       2 years 28 years
Amount spent for Source Control work   100,000      
Amount anticipated to spent for further Source Control work   100,000      
Cost of remedy expected to be allocated among potentially responsible parties   100      
Total stand-by letters of credit   $ 3,100,000