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Summary of Significant Accounting Policies - Common Stock and Convertible Stock Dilutive in Weighted average unearned PSUs outstanding (Detail) EquityUnit in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 EquityUnit $ / EquityUnit	Jun. 30, 2019 EquityUnit $ / EquityUnit	Jun. 30, 2020 EquityUnit $ / EquityUnit	Jun. 30, 2019 EquityUnit $ / EquityUnit
Earnings Per Share [Abstract]
Weighted average PSUs | EquityUnit	976	335	951	335
Weighted average grant date fair value per unit | $ / EquityUnit	9.33	12.93	9.33	12.93

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Antidilutive securities performance share units excluded from computation of earnings per share amount.

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