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Net Income Per Share - Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share (Detail) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share | 46,559,835 | 45,367,932 | 45,723,524
Weighted average number of common shares used for basic earnings per share | 45,665,883 | 45,367,932 | 45,212,414
Warrant [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 4,053,670 | 0
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares | 441,104 | 0 |
Employee Stock Option [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 16,667 | 126,667 | 110,000
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares | 0 | 0 |
Restricted Stock Units (RSUs) [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 68,654 | 0
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares | 77,572 | 0 |
Performance Shares [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 322,943 | 0
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares | 375,276 | 0 |
Warrant [Member] |  |  |
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares |  |  | 447
Employee Stock Option [Member] |  |  |
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares |  |  | 312,619
Performance Shares [Member] |  |  |
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares |  |  | 81,939
Restricted Stock Units (RSUs) [Member] |  |  |
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares |  |  | 116,105

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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