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Fair Value of Financial Instruments - Summary Showing Sensitivity Analysis by Using Basis Point Variations (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended |
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Mar. 31, 2013
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+100 basis points
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |
| Estimated Increase (Decrease)In Fair Value Of Financial instrument | $ (235) |
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- 100 basis points
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|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |
| Estimated Increase (Decrease)In Fair Value Of Financial instrument | $ 235 |