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Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2017
Summary Of Shares Repurchased Under Stock Purchase Program [Abstract]
Number of shares repurchased	151,264	200,000
Average price of shares repurchased	$ 52.32	$ 27.62
Shares remaining to be repurchased	148,736	300,000	300,000

X

- Definition

Summary of shares repurchased under stock purchase program.

+ References

No definition available.

+ Details

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X

- Definition

Number of stock bought back by the entity at the exercise price or redemption price.

+ 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
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

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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

No definition available.

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X

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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