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Earnings per Share - Schedule of Computation of Basic and Diluted EPS (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Earnings Per Share [Abstract] |  |  |  |
Net Income | $ 21,302 | $ 11,642 | $ 50,270 | $ 25,459
Noncontrolling interests | (213) |  | 164 |
Allocation of earnings to preferred stockholders |  |  |  | (64)
Net Income Attributable to Common Stockholders | $ 21,089 | $ 11,642 | $ 50,434 | $ 25,395
Shares (in thousands): |  |  |  |
Basic: Weighted-average number of shares outstanding | 7,995 | 7,843 | 7,879 | 7,692
Plus: Incremental shares from assumed conversion of dilutive instruments | 232 | 274 | 246 | 363
Diluted: Weighted-average number of shares outstanding | 8,227 | 8,117 | 8,125 | 8,055
Earnings per share - Basic | $ 2.64 | $ 1.48 | $ 6.40 | $ 3.30
Earnings per share - Diluted | $ 2.56 | $ 1.43 | $ 6.21 | $ 3.15

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