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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Interest Costs Incurred [Abstract]        
Interest capitalized, beginning of period $ 3,810 $ 2,454 $ 3,294 $ 893
Interest incurred 6,293 6,287 18,716 18,801
Interest charged to interest expense (5,775) (5,682) (17,292) (16,622)
Interest charged to cost of sales (301) (38) (691) (51)
Interest capitalized, end of period $ 4,027 $ 3,021 $ 4,027 $ 3,021