XML 40 R53.htm IDEA: XBRL DOCUMENT v2.4.0.8
Stock-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation capitalized into construction $ 5,535 $ 48
Stock Options And Restricted Stock
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   9 years