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	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012
Interest Costs Incurred [Abstract]
Interest capitalized, beginning of period	$ 1,577	$ 893	$ 0
Interest incurred	6,264	12,514
Interest charged to interest expense	(5,374)	(10,940)
Interest charged to cost of sales	(13)	(13)
Interest capitalized, end of period	$ 2,454	$ 2,454	$ 0