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Summary of Significant Accounting Policies - Schedule of Weighted-Average Common Shares Outstanding (Detail)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Accounting Policies [Abstract] | |||
| Weighted average shares outstanding | 38,477 | 31,688 | 30,340 |
| Dilutive effect of equity-based compensation plans | 1,481 | ||
| Weighted-average shares outstanding, assuming dilution | 39,958 | 31,688 | 30,340 |