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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest Costs Incurred [Abstract]
Interest capitalized, beginning of period	$ 3,618	$ 1,577	$ 3,294	$ 893
Interest incurred	6,200	6,264	12,423	12,514
Interest charged to interest expense	(5,723)	(5,374)	(11,517)	(10,940)
Interest charged to cost of sales	(285)	(13)	(390)	(13)
Interest capitalized, end of period	$ 3,810	$ 2,454	$ 3,810	$ 2,454