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Derivative Financial Instruments - Notional Amount and Fair Value of Foreign Currency Forward Contract (Detail) € in Thousands, £ in Thousands, CAD in Thousands, $ in Thousands | Sep. 30, 2016 USD ($) | Sep. 30, 2016 CAD | Sep. 30, 2016 GBP (£) | Sep. 30, 2016 EUR (€) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CAD | Dec. 31, 2015 GBP (£) | Dec. 31, 2015 EUR (€)
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Financial Institution Counterparties [Member] | Other Assets [Member] | Non Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Notional Amount |  | CAD 2,291 | £ 466 | € 0 |  | CAD 0 | £ 568 | € 1,247
Financial Institution Counterparties [Member] | Other Liabilities [Member] | Non Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Liability Notional Amount |  | 0 |  | 955 |  | 1,440 |  | 572
Customer Counterparties [Member] | Other Assets [Member] | Non Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Notional Amount |  | CAD 2,283 |  | 0 |  | CAD 1,437 |  | 575
Customer Counterparties [Member] | Other Liabilities [Member] | Non Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Liability Notional Amount | € |  |  |  | € 0 |  |  |  | € 343
Foreign Exchange Forward [Member] | Financial Institution Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Estimated Fair Value | $ 4 |  |  |  | $ 0 |  |  |
Forward Contracts – Liability Estimated Fair Value | 0 |  |  |  | (5) |  |  |
Foreign Exchange Forward [Member] | Customer Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Estimated Fair Value | 4 |  |  |  | 9 |  |  |
GBP Foreign Exchange Forward [Member] | Financial Institution Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Estimated Fair Value | 1 |  |  |  | 2 |  |  |
Eurodollar Future [Member] | Financial Institution Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Estimated Fair Value | 0 |  |  |  | 13 |  |  |
Forward Contracts – Liability Estimated Fair Value | (3) |  |  |  | (18) |  |  |
Eurodollar Future [Member] | Customer Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Estimated Fair Value | 0 |  |  |  | 22 |  |  |
Forward Contracts – Liability Estimated Fair Value | $ 0 |  |  |  | $ (5) |  |  |

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 + Details
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