Annual report pursuant to Section 13 and 15(d)

Capitalization of Interest - Additional Information (Detail)

v2.4.1.9
Capitalization of Interest - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Interest expense $ 1.2us-gaap_InterestCostsCapitalized