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.

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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
	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