Capitalized Interest - Summary of Interest Costs Incurred, Capitalized, Expensed and Charged to Cost of Sales (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Costs Incurred [Abstract]
Interest capitalized, beginning of period	$ 2,454		$ 893
Interest incurred	6,287	1,678	18,801	2,201
Interest charged to interest expense	(5,682)	(1,511)	(16,622)	(2,034)
Interest charged to cost of sales	(38)		(51)
Interest capitalized, end of period	$ 3,021	$ 167	$ 3,021	$ 167