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Summary of Significant Accounting Policies - Basic and Diluted Shares Outstanding (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Accounting Policies [Abstract] | |||
| Weighted average common shares outstanding - Basic | 20,364 | 19,649 | 18,889 |
| Effect of dilutive options (in shares) | 37 | 51 | 60 |
| Weighted average common shares outstanding - Diluted | 20,401 | 19,700 | 18,949 |
| Average share price (in usd per share) | $ 45.44 | $ 40.94 | $ 39.39 |