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Stock Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense recognized at date of grant $ 0 $ 1,008
Amortization related to restricted stock and unit awards 1,575 1,826
Amortization capitalized in development activities 19 11
Unrecognized compensation related to unvested restricted stock and unit awards 7,614  
Weighted average period of unrecognized compensation expected to be recognized 11 months 5 days  
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awards to employees 115,587  
Unrecognized compensation related to unvested restricted stock and unit awards $ 2,064  
Restricted Stock [Member] | Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period of restricted stock 3 years  
Contingent Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awards to employees 184,218