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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, 2015 USD ($) | Sep. 30, 2015 CAD | Sep. 30, 2015 EUR (€) | Sep. 30, 2015 GBP (£) | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CAD | Dec. 31, 2014 EUR (€) | Dec. 31, 2014 GBP (£)
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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 0 | € 857 | £ 532 |  | CAD 24,724 | € 936 | £ 0
Financial Institution Counterparties [Member] | Other Liabilities [Member] | Non Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Liability Notional Amount |  | 2,985 | 572 | £ 0 |  | 0 | 0 | £ 544
Customer Counterparties [Member] | Other Assets [Member] | Non Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Notional Amount |  | 2,980 | 575 |  |  | 0 | 0 |
Customer Counterparties [Member] | Other Liabilities [Member] | Non Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Liability Notional Amount |  | CAD 0 | € 15 |  |  | CAD 24,680 | € 0 |
Foreign Exchange Forward [Member] | Financial Institution Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Estimated Fair Value | $ 0 |  |  |  | $ 659 |  |  |
Forward Contracts – Liability Estimated Fair Value | (18) |  |  |  | 0 |  |  |
Foreign Exchange Forward [Member] | Customer Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Estimated Fair Value | 24 |  |  |  | 0 |  |  |
Forward Contracts – Liability Estimated Fair Value | 0 |  |  |  | (615) |  |  |
GBP Foreign Exchange Forward [Member] | Financial Institution Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Estimated Fair Value | 2 |  |  |  | 0 |  |  |
Forward Contracts – Liability Estimated Fair Value | 0 |  |  |  | (2) |  |  |
Eurodollar Future [Member] | Financial Institution Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Estimated Fair Value | 2 |  |  |  | 7 |  |  |
Forward Contracts – Liability Estimated Fair Value | (1) |  |  |  | 0 |  |  |
Eurodollar Future [Member] | Customer Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts – Assets Estimated Fair Value | 5 |  |  |  | 0 |  |  |
Forward Contracts – Liability Estimated Fair Value | $ 0 |  |  |  | $ 0 |  |  |

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