Annual report pursuant to Section 13 and 15(d)

Basis of Presentation - Investments in Venezuelan Bonds (Detail)

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Basis of Presentation - Investments in Venezuelan Bonds (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]  
Investments in Venezuelan bonds, Market Value $ 4,188
Venezuelan bonds [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Investments in Venezuelan bonds, Amortized Costs 4,042
Investments in Venezuelan bonds, Gross Unrealized Gain 146
Investments in Venezuelan bonds, Gross Unrealized Loss   
Investments in Venezuelan bonds, Net Unrealized Gain 146
Investments in Venezuelan bonds, Market Value $ 4,188