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Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Assets Sold Under Agreements To Repurchase [Line Items]
Long-term debt, fair value	$ 490,800,000		$ 490,800,000		$ 513,500,000
Long-term debt, carrying value	475,000,000		475,000,000		$ 500,000,000
Fair value of future expected acquisition-related contingent consideration obligations	5,200,000		$ 5,200,000
Contingent purchase price obligation payment extending year			2018
Gain/Loss on remeasurement of contingent consideration	$ 0	$ 0	$ 1,000,000	$ 1,700,000
Contractual Settlement				$ 1,500,000
2022 Notes
Assets Sold Under Agreements To Repurchase [Line Items]
Interest percentage	6.00%		6.00%
Debt maturity period			2022		2022
Senior Bank Credit Facility
Assets Sold Under Agreements To Repurchase [Line Items]
Line of credit maximum borrowing capacity	$ 550,000,000		$ 550,000,000		$ 550,000,000

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Debt instrument maturity year.

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Gain or Loss on remeasurement Of Contingent Consideration

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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