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Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Net income | $ 2,479 | $ 16,724 | $ 11,303 | $ 26,148
Less: Income distributed to participating securities | (539) | (513) | (1,083) | (584)
Less: Undistributed income allocable to participating securities | 0 | (1,101) | (117) | (999)
Net income available to common stockholders | $ 1,940 | $ 15,110 | $ 10,103 | $ 24,565
Weighted average common shares (in thousands) | 151,818 | 149,056 | 151,722 | 142,230
Basic earnings per share | $ 0.01 | $ 0.10 | $ 0.07 | $ 0.17
Net income | $ 2,479 | $ 16,724 | $ 11,303 | $ 26,148
Weighted average common shares | 151,818 | 149,056 | 151,722 | 142,230
Dilutive effect of common stock equivalents | 15,431 | 14,290 | 15,133 | 7,749
Weighted average diluted shares | 167,249 | 163,346 | 166,855 | 149,979
Diluted earnings per share | $ 0.01 | $ 0.10 | $ 0.07 | $ 0.17

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