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Summary of Significant Accounting Policies - Reconciliation of Weighted-Average Common Shares Outstanding Used in the Calculation of Basic Net Income (Loss) Per Share and Diluted Net Income (Loss) Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Weighted average common shares outstanding (in shares)	40,135	40,427	40,208
Assumed conversion of restricted stock (in shares)	202	22	96
Diluted weighted average common stock outstanding (in shares)	40,337	40,449	40,304
Antidilutive securities excluded from computation of earnings per share (in shares)	764	854	251

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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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.

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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.

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