Senior Debt - Summary of Debt (Parenthetical) (Detail) - 12 months ended Dec. 31, 2016 $ in Millions	USD ($)	EUR (€)
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Term loans, year of maturity	2016-01	2016-01
Interest rate	3.82%	3.82%
U S Dollar Euro [Member]
Debt Instrument [Line Items]
Outstanding borrowings, quarterly principal installments payable amount \| €		€ 25,000
Term Loan [Member] \| Debt Instrument, Redemption, through September 2017 [Member]
Debt Instrument [Line Items]
Outstanding borrowings, quarterly principal installments payable amount	$ 1.7
Term loans, year of maturity	2017-09	2017-09
Term Loan [Member] \| Debt Instrument, Redemption, through September 2018 [Member]
Debt Instrument [Line Items]
Outstanding borrowings, quarterly principal installments payable amount	$ 2.3
Term loans, year of maturity	2018-09	2018-09
Term Loan [Member] \| Debt Instrument, Redemption, through September 2020 [Member]
Debt Instrument [Line Items]
Outstanding borrowings, quarterly principal installments payable amount	$ 2.9
Term loans, year of maturity	2020-09	2020-09

Debt instruments maturity month year.

No definition available.

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- 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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- 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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- Definition

Amount of the required periodic payment applied to principal.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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