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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 | 46,147,062 | 45,954,908 | 46,559,835
Weighted Average Number of Shares Outstanding, Basic | 46,147,062 | 45,954,908 | 45,665,883
Warrant [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 4,877,754 | 4,877,783 | 0
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares | 0 | 0 |
Share-based Payment Arrangement, Option [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 16,121 | 16,667 | 16,667
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 | 302,145 | 249,263 | 0
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares | 0 | 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 | 1,002,501 | 872,258 | 0
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares | 0 | 0 |
Warrant [Member] |  |  |
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares |  |  | 0
Share-based Payment Arrangement, Option [Member] |  |  |
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares |  |  | 441,104
Performance Shares [Member] |  |  |
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares |  |  | 375,276
Restricted Stock Units (RSUs) [Member] |  |  |
Effect of potential dilutive shares: |  |  |
Effect of potential dilutive shares |  |  | 77,572

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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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