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Permanent Equity and Restrictions - Summary of Share Transactions Occurred in Stockholders' Equity During the Year (Detail)
 1 Months Ended 2 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2013
Sep. 30, 2012
Jan. 31, 2012
Aug. 31, 2011
Dec. 31, 2011
Dec. 31, 2011
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Common Stock [Member]
Dec. 31, 2011
Common Stock [Member]
Dec. 31, 2010
Common Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2010
Restricted Stock [Member]
Dec. 31, 2012
Treasury Stock [Member]
Dec. 31, 2011
Treasury Stock [Member]
Dec. 31, 2009
Treasury Stock [Member]
Stockholders Equity Note [Line Items]                                      
Beginning Balance 11,552,551   12,679,717       12,679,717 12,679,717 10,482,684 10,292,947 10,132,497 10,370,858 10,307,238 2,597,620 162,226 36,109 (50,400) (50,400) (50,400)
Issuance of shares               230,846 313,051   230,846 313,051                
Issuance as Equity-Based Compensation               428,984 3,924,612 216,383        428,984 3,924,612 216,383       
Vesting of shares 186,339   186,339                643,830 140,857 89,572 (643,830) (140,857) (89,572)       
Shares withheld for Employee Taxes               (162,048) (24,668) (25,952) (162,048) (24,668) (25,952)              
Forfeiture of Restricted Stock               (1,508,353) (1,348,361) (694)        (1,508,353) (1,348,361) (694)       
Ending Balance         12,679,717 12,679,717   11,552,551 12,679,717 10,482,684 10,794,725 10,132,497 10,370,858 757,826 2,597,620 162,226   (50,400) (50,400)
Purchase of Common Stock for Treasury       (647,701) (19,900) (667,601)     (667,601)                   (667,601)  
Retirement of Treasury Stock   50,400       667,601 50,400        (50,400) (667,601)          50,400 667,601  
Surrender of Restricted Stock               (116,595)           (116,595)