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Capital Stock - Additional Information (Detail)
Mar. 31, 2015
Dec. 31, 2014
Class Of Stock Disclosures [Abstract]    
Authorized capital stock 485,000,000us-gaap_CapitalUnitsAuthorized 485,000,000us-gaap_CapitalUnitsAuthorized
Common stock, shares authorized 475,000,000us-gaap_CommonStockSharesAuthorized 475,000,000us-gaap_CommonStockSharesAuthorized
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding