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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 |
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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) |  |  |  |  |

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