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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Commitment And Contingencies [Line Items]  
Total expended with respect to the assessment $ 111
Other liabilities, accrued at acquisition, net 39
Environmental Remediation Expense [Member]
  
Commitment And Contingencies [Line Items]  
Recorded liability, at acquisition $ 150