| 
           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 | 
| X | ||||||||||
| 
             
- Definition 
          Available For Sale Debt Securities Gross Unrealized Gain Accumulated Investments No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale debt securities impacting investments. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount of debt securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  |