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Income Taxes - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2016
USD ($)
Income Taxes [Line Items]  
Net deferred tax asset $ 0
Income tax expense 0
Dividend from subsidiaries $ 3,900,000
Estimated annual effective tax rate 11.40%
Effective tax rate 0.00%
Federal [Member]  
Income Taxes [Line Items]  
Net operating loss carryforwards $ 2,500,000
Net operating loss carryforwards subject to expiration $ 146,000,000
Net operating loss carryforwards expiration year 2025
Net operating loss carryforwards expiration year 2035
Foreign [Member]  
Income Taxes [Line Items]  
Net operating loss carryforwards $ 4,400,000
Net operating loss carryforwards subject to expiration $ 24,000,000