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Summary of Significant Accounting Policies - Reconciliation of Weighted-Average Common Shares Outstanding Used in the Calculation of Basic Net Income Per Share and Diluted Net Income Per Share (Detail) - shares shares in Thousands | 3 Months Ended | 12 Months Ended
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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
Weighted-average number of common shares: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding | 40,393 | 40,384 | 40,347 | 39,697 | 30,952 | 22,189 | 22,145 | 22,135 | 40,208 | 24,322 | 22,114
Assumed conversion of warrant |  |  |  |  |  |  |  |  |  |  | 4,000
Assumed conversion of restricted stock |  |  |  |  |  |  |  |  | 96 | 257 | 286
Diluted weighted average common stock outstanding | 40,435 | 40,416 | 40,453 | 39,874 | 31,210 | 22,189 | 22,145 | 26,410 | 40,304 | 24,579 | 26,400

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that 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 -Subparagraph (a) -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 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1448-109256 + Details
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