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Summary of Significant Accounting Policies - Summary of Excess Tax Benefit (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
|---|---|---|
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Mar. 31, 2015
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Mar. 31, 2014
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| Accounting Policies [Abstract] | ||
| Excess tax benefit from stock-based compensation, net | $ 3,048 | $ 3,579 |