Derivative Financial Instruments - Summary of Outstanding Non-designated Hedges (Detail) - Not Designated as Hedging Instrument [Member] € in Thousands, £ in Thousands, CAD in Thousands, $ in Thousands	Dec. 31, 2015 USD ($) DerivativeInstrument	Dec. 31, 2015 GBP (£) DerivativeInstrument	Dec. 31, 2015 CAD DerivativeInstrument	Dec. 31, 2015 EUR (€) DerivativeInstrument
Foreign Exchange Forward [Member] | CAD [Member] | Buy CAD / Sell USD Forward [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments	1	1	1	1
Notional Amount | CAD			CAD 1,000
Foreign Exchange Forward [Member] | CAD [Member] | Buy USD / Sell CAD Forward [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments	1	1	1	1
Notional Amount | CAD			CAD 1,000
Foreign Exchange Forward [Member] | GBP [Member] | Buy GBP / Sell USD Forward [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments	1	1	1	1
Notional Amount | £		£ 10,400
Foreign Exchange Forward [Member] | GBP [Member] | Buy USD / Sell GBP Forward [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments	1	1	1	1
Notional Amount | £		£ 10,400
Foreign Exchange Forward [Member] | EUR [Member] | Buy GBP / Sell EUR Forward [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments	1	1	1	1
Notional Amount | €				€ 12,857
Interest Rate Caps [Member] | CAD [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments	4	4	4	4
Notional Amount | CAD			CAD 67,303
Interest Rate Caps [Member] | USD [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments	1	1	1	1
Notional Amount | $	$ 13,387