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Stockholders' equity - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2010
Accumulated Other Comprehensive Income Loss [Line Items]
Number of shares authorized for repurchase			2,000,000
Shares available for repurchase under the plan	1,840,697	1,951,000
Aggregate purchase price	$ 1.4
Common stock
Accumulated Other Comprehensive Income Loss [Line Items]
Stock repurchased and acquired in market transactions	110,303
Aggregate purchase price	$ 1.4

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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

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