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Long-Term Debt - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2013
Senior Secured Notes [Member]
Apr. 12, 2011
Senior Secured Credit Note [Member]
Apr. 12, 2011
Subordinated Note [Member]
Jun. 30, 2013
Senior Secured Notes [Member]
Jun. 30, 2012
Senior Secured Notes [Member]
Dec. 31, 2011
Senior Secured Notes [Member]
Jun. 30, 2013
Senior Secured Notes [Member]
Jun. 30, 2012
Senior Secured Notes [Member]
Nov. 30, 2011
Senior Secured Notes [Member]
Apr. 12, 2011
Private Placement [Member]
Senior Secured Notes [Member]
Debt Instrument [Line Items]                    
Issuance of private placement, Principal amount                   $ 200,000,000
Interest rate 8.75%                 8.75%
Retirement of Notes, Principal amount   22,400,000 100,000,000              
Cost to issue the Notes                   4,600,000
Term of payments of interest on notes                   Semi-annually
Private placement date                   Apr. 12, 2011
Repurchase of notes                 5,000,000  
Repurchase of notes at cost                 4,700,000  
Gain on repurchase notes           300,000        
Interest expense on note       4,300,000 4,300,000   8,500,000 8,500,000    
Senior Notes Trading value 105.69                  
Senior Notes base value $ 100