Share Repurchase Program - Additional Information (Detail) - Share Repurchase Program [Member] - USD ($)	1 Months Ended	9 Months Ended
Jan. 31, 2019	Sep. 30, 2020
Equity Class Of Treasury Stock [Line Items]
Total shares repurchased		37,312
Cost of common stock shares repurchased		$ 15,500,000
Shares repurchase program period	2 years
Shares repurchase program authorized	$ 100,000,000.0
Commencement date	2019-04

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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