Other Assets - Schedule of Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Assets [Line Items]
Restricted cash-LT	$ 11,989	$ 11,495
Long-term investments	52,939	49,529
Prepaid land rent	112,940	57,510
Straight-line receivable	116,361	64,357
Other	61,051	28,911
Total other assets	$ 355,280	$ 211,802