Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities - Additional Information (Detail)

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Accrued Liabilities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accrued Liabilities [Line Items]    
Severance and termination benefit $ 5,500 $ 2,031
Severance and termination benefit
   
Accrued Liabilities [Line Items]    
Severance and termination benefit $ 2,500