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Deferred costs and other intangibles - Amortization Expense Related to Deferred Costs and Other Intangibles (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]  
Total $ 20,573
Value of In-place Leases [Member]
  
Finite-Lived Intangible Assets [Line Items]  
2014 1,353
2015   
2016   
2017   
2018   
Thereafter   
Total 1,353
Trademark [Member]
  
Finite-Lived Intangible Assets [Line Items]  
2014 660
2015 660
2016 660
2017 660
2018 91
Thereafter   
Total 2,731
Database [Member]
  
Finite-Lived Intangible Assets [Line Items]  
2014 300
2015 300
2016 300
2017 300
2018 300
Thereafter 432
Total 1,932
Deferred Leasing Costs [Member]
  
Finite-Lived Intangible Assets [Line Items]  
2014 6,081
2015 2
2016   
2017   
2018   
Thereafter   
Total 6,083
Deferred Financing Costs [Member]
  
Finite-Lived Intangible Assets [Line Items]  
2014 2,322
2015 2,321
2016 2,328
2017 986
2018 517
Thereafter   
Total $ 8,474