XML 72 R99.htm IDEA: XBRL DOCUMENT v2.4.0.8
Goodwill and intangibles - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Trademarks and Trade Name [Member]
Jan. 31, 2008
Below Market Lease [Member]
Jan. 31, 2008
Customer Relationships [Member]
Dec. 31, 2012
Customer Relationships [Member]
Goodwill [Line Items]                  
Discount rate     11.80%            
Terminal growth rate     3.00%            
Carrying value of intangibles     $ 31,700,000 $ 31,700,000   $ 31,700,000      
Impairment of trademarks and trade names           0      
Amortization expenses 3,200,000 1,100,000   3,889,000 5,390,000        
Amortization period             60 months 180 months  
Customer relationship intangible asset                 $ 630,000