Derivative Financial Instruments - Notional Amount and Fair Value of Foreign Currency Forward Contract (Detail) In Thousands, unless otherwise specified	Jun. 30, 2014 Financial Institution Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] CAD	Jun. 30, 2014 Financial Institution Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] EUR (€)	Dec. 31, 2013 Financial Institution Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] CAD	Dec. 31, 2013 Financial Institution Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] EUR (€)	Jun. 30, 2014 Financial Institution Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] CAD	Jun. 30, 2014 Financial Institution Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] EUR (€)	Jun. 30, 2014 Financial Institution Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] GBP (£)	Dec. 31, 2013 Financial Institution Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] CAD	Dec. 31, 2013 Financial Institution Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] EUR (€)	Dec. 31, 2013 Financial Institution Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] GBP (£)	Jun. 30, 2014 Customer Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] CAD	Dec. 31, 2013 Customer Counterparties [Member] Other Assets [Member] Non Designated as Hedging Instrument [Member] CAD	Jun. 30, 2014 Customer Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] CAD	Dec. 31, 2013 Customer Counterparties [Member] Other Liabilities [Member] Non Designated as Hedging Instrument [Member] CAD	Jun. 30, 2014 Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($)	Dec. 31, 2013 Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($)	Jun. 30, 2014 Foreign Exchange Forward [Member] Customer Counterparties [Member] USD ($)	Dec. 31, 2013 Foreign Exchange Forward [Member] Customer Counterparties [Member] USD ($)	Jun. 30, 2014 GBP Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($)	Dec. 31, 2013 GBP Foreign Exchange Forward [Member] Financial Institution Counterparties [Member] USD ($)	Jun. 30, 2014 Eurodollar Foreign Exchange Forward [Member] [Member] Financial Institution Counterparties [Member] USD ($)	Dec. 31, 2013 Eurodollar Foreign Exchange Forward [Member] [Member] Financial Institution Counterparties [Member] USD ($)
Derivative Counter Party [Line Items]
Forward Contracts – Assets Notional Amount	0	€ 0	18,886	€ 1,175							27,599	14,055
Forward Contracts – Liability Notional Amount					27,637	1,078	548	14,078	494	0			0	18,859
Forward Contracts – Assets Estimated Fair Value															0	85	475	45			0	5
Forward Contracts – Liability Estimated Fair Value															$ (437)	$ (23)	$ 0	$ (58)	$ (9)	$ 0	$ (8)	$ (4)