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Long-term debt - Schedule of Long-Term Debt (Parenthetical) (Detail) (USD $)
 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2011
Apr. 12, 2011
Senior Secured Notes [Member]
Jun. 30, 2011
Senior Secured Notes [Member]
Apr. 12, 2011
Senior Secured Credit Note [Member]
Jun. 30, 2011
Senior Secured Credit Note [Member]
Dec. 31, 2006
Senior Secured Credit Note [Member]
Apr. 12, 2011
Subordinated Note [Member]
Jan. 14, 2008
Subordinated Note [Member]
Jun. 30, 2011
Subordinated Note [Member]
Debt Instrument [Line Items]                  
Issuance of private placement, Principal amount   $ 200,000,000              
Interest rate   8.75%              
Retirement Of Notes, Principal amount       22,400,000     100,000,000    
Cost to issue the Notes 4,565,000   4,600,000            
Unamortized debt issuance costs         344,000        
Effective portion of the net loss                 1,300,000
Term of payments of interest on notes   Semi-annually              
Private placement date   Apr. 12, 2011              
Issuance of senior secured credit note, Principal amount           125,000,000      
Term of Senior Secured Credit Note           7 years      
Issuance of subordinate note, Principal amount               $ 100,000,000