Other Comprehensive Loss - Changes in Accumulated OCI by Component (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Amortization of interest-rate contracts	$ 472	$ 472	$ 921
Reclassification adjustment of foreign currency translation	21,755
Sonae Sierra Brazil [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification adjustment of foreign currency translation	19,700
Interest Expense [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Amortization of interest-rate contracts	600	600
Equity in Net Income of Joint Ventures [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Amortization of interest-rate contracts	100	100
Foreign Currency [Member] | Russia and Canada [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification adjustment of foreign currency translation	$ 2,100