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Long-Term Debt - Additional Information (Detail) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Senior Secured Notes [Member]
Dec. 31, 2013
Senior Secured Notes [Member]
Dec. 31, 2012
Senior Secured Notes [Member]
Dec. 31, 2011
Senior Secured Notes [Member]
Nov. 30, 2011
Senior Secured Notes [Member]
Dec. 31, 2013
Senior Secured Notes [Member]
Apr. 12, 2011
Senior Secured Notes [Member]
Private Placement [Member]
Dec. 31, 2013
Senior Secured Notes [Member]
Private Placement [Member]
Apr. 12, 2011
Senior Secured Credit Note [Member]
Apr. 12, 2011
Subordinated Note [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 4,565,000             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     17,100,000 17,100,000 12,500,000            
Interest paid on notes     $ 17,100,000 $ 17,100,000