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Background and Basis of Presentation - Summary of Earnings, Weighted Average Common Shares and Potential Common Shares Outstanding (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | |
|---|---|---|
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Mar. 31, 2015
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Mar. 31, 2014
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| Numerator: | ||
| Net income for basic and diluted earnings per share | $ 39,476 | $ 64,487 |
| Denominator: | ||
| Weighted average shares outstanding - basic | 188,480 | 185,942 |
| Dilutive effect of equity-based awards | 4,657 | 4,980 |
| Weighted average common shares outstanding - diluted | 193,137 | 190,922 |
| Earnings per share: | ||
| Basic | $ 0.21 | $ 0.35 |
| Diluted | $ 0.20 | $ 0.34 |