Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v2.4.0.8
Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Income Taxes [Line Items]    
U.S. net operating loss carryforwards, expiration year 2033  
Unrecognized tax benefits $ 10,894,000 $ 0
Internal Revenue Service (IRS)
    
Schedule Of Income Taxes [Line Items]    
Net operating loss carryforwards 3,600,000  
NORWAY
    
Schedule Of Income Taxes [Line Items]    
Net operating loss carryforwards 88,000,000  
State and Local Jurisdiction
    
Schedule Of Income Taxes [Line Items]    
Net operating loss carryforwards $ 42,300,000  
Minimum
    
Schedule Of Income Taxes [Line Items]    
U.S. net operating loss carryforwards, expiration year 2025  
Percentage of change in ownership 50.00%  
Maximum
    
Schedule Of Income Taxes [Line Items]    
U.S. net operating loss carryforwards, expiration year 2033