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Stockholders' Equity - Additional Information (Detail) - shares	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Jun. 30, 2019	Oct. 31, 2017	Jul. 31, 2017
Maximum [Member]
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, number of outstanding shares authorized to repurchase				966,000	905,000
July 2017 Stock Repurchase Program [Member]
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, number of shares repurchased	0	0	0
Stock repurchase program, remaining available for repurchase	903,636	903,636

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

+ References

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- Definition

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

+ References

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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