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Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Expense related to increase in fair value of future expected contingent consideration	$ 0	$ 200,000
Senior Notes | 6.0% senior notes due 2022
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate (as a percent)			6.00%
Debt maturity period			2022

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- Definition

Debt instrument maturity year.

+ References

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X

- Definition

Gain or (Loss) on remeasurement Of Contingent Consideration

+ References

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X

- Definition

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.

+ References

No definition available.

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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