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Long-term debt - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Senior Secured Credit Note [Member]
Dec. 31, 2010
Senior Secured Credit Note [Member]
Apr. 12, 2011
Senior Secured Credit Note [Member]
Apr. 12, 2011
Subordinated Note [Member]
Dec. 31, 2011
Subordinated Note [Member]
Dec. 31, 2010
Subordinated Note [Member]
Dec. 31, 2012
Senior Secured Notes [Member]
Dec. 31, 2011
Senior Secured Notes [Member]
Dec. 31, 2010
Senior Secured Notes [Member]
Debt Instrument [Line Items]                  
Repurchase of notes               $ 5,000,000  
Repurchase of notes at cost               4,700,000  
Gain on repurchase notes               300,000  
Interest expense on note 306,000 1,500,000     1,600,000 5,700,000 17,100,000 12,500,000 0
Interest paid on notes             17,100,000 8,900,000  
Senior Notes trading value             104.56    
Senior Notes base value             100    
Senior secured credit note repayment, Principal balance     22,400,000            
Subordinated note repayment, Principal balance       $ 100,000,000