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Earnings Per Share - Computation of Basic and Diluted Net Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 66,807 | $ 43,840 | $ 20,945
Less: income allocable to participating securities |  |  |  |  |  |  |  |  | (171) | (333) | (270)
Income allocable to common shares |  |  |  |  |  |  |  |  | 66,636 | 43,507 | 20,675
Add back: undistributed earnings allocable to participating securities |  |  |  |  |  |  |  |  | 171 | 333 | 270
Less: undistributed earnings reallocated to participating securities |  |  |  |  |  |  |  |  | (168) | (333) | (264)
Numerator for diluted earnings per share |  |  |  |  |  |  |  |  | $ 66,639 | $ 43,507 | $ 20,681
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  |  |  |  |  |  |  | 50,315,455 | 50,315,455 | 50,315,455
Weighted average common shares repurchased |  |  |  |  |  |  |  |  | (1,526,930) | (286,699) |
Adjustment for vested restricted stock |  |  |  |  |  |  |  |  | 9,050,630 | 7,521,448 | 6,179,715
Shares for calculating basic earnings per share | 58,100,141 | 58,003,222 | 57,898,914 | 57,307,187 | 57,652,531 | 57,819,734 | 57,591,556 | 57,132,909 | 57,839,155 | 57,550,204 | 56,495,170
Dilutive effect of unvested restricted stock |  |  |  |  |  |  |  |  | 950,864 | 1,417,895 | 1,424,530
Shares for calculating diluted earnings per share | 58,850,271 | 58,873,502 | 58,816,442 | 58,525,980 | 58,882,966 | 58,907,281 | 58,697,229 | 58,362,040 | 58,790,019 | 58,968,099 | 57,919,700
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.22 | $ 0.24 | $ 0.24 | $ 0.44 | $ 0.15 | $ 0.11 | $ 0.18 | $ 0.32 | $ 1.15 | $ 0.76 | $ 0.37
Diluted | $ 0.22 | $ 0.24 | $ 0.24 | $ 0.43 | $ 0.15 | $ 0.10 | $ 0.18 | $ 0.31 | $ 1.13 | $ 0.74 | $ 0.36

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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