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Subsequent Events - Additional Information (Detail) $ / shares in Units, $ in Thousands		1 Months Ended				3 Months Ended	12 Months Ended
	Jan. 10, 2019 USD ($) Business	Mar. 12, 2019 shares	Jan. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 $ / shares shares	Nov. 30, 2018 $ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2018 USD ($) Business	Dec. 31, 2017 USD ($)
Subsequent Event [Line Items]
Business combination, number of businesses acquired | Business							4
Business combination, cash consideration							$ 19,851	$ 81,896
Amount paid for common shares purchase							$ 7,287
Common Stock
Subsequent Event [Line Items]
Number of shares purchased | shares				255,500	196,858	452,358
Average price paid per share | $ / shares				$ 15.35	$ 17.10	$ 16.11
Subsequent Event
Subsequent Event [Line Items]
Amount paid for common shares purchase			$ 2,605
Subsequent Event | Common Stock
Subsequent Event [Line Items]
Number of shares purchased | shares		0	158,048
Average price paid per share | $ / shares			$ 16.48
Subsequent Event | Agrovant and Defensive
Subsequent Event [Line Items]
Business combination, number of businesses acquired | Business	2
Business combination, cash consideration	$ 22,099

X

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

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X

- Definition

The cash outflow to reacquire common stock during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

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X

- Definition

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

+ References

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-SubTopic 30
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X

- Definition

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

+ References

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