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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 9 Months Ended |  | 1 Months Ended | 12 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |
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Jul. 01, 2009 | Sep. 30, 2013 | Dec. 31, 2012 | Jul. 01, 2009 Contingent Value Rights (CVRs) [Member] | Dec. 31, 2012 Contingent Value Rights (CVRs) [Member] | Sep. 30, 2013 Class A-1 [Member] | Jul. 01, 2009 Class A-1 [Member] | Sep. 30, 2013 Common Class A 2 [Member] | Jul. 01, 2009 Common Class A 2 [Member] | Sep. 30, 2013 Common Class A3 [Member] | Jul. 01, 2009 Common Class A3 [Member] | Jul. 01, 2009 Class A Warrants [Member] | Sep. 30, 2013 Class B Warrants [Member] | Jul. 01, 2009 Class B Warrants [Member]
Common stock, shares outstanding |  | 14,218,823 | 13,933,529 |  |  |  |  |  |  |  |  |  |  |
Number of warrants entitled for purchase |  |  |  |  |  |  | 1,000,000 |  | 1,000,000 |  | 1,000,000 |  |  |
Aggregate amount of common stock |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  | 1,500,000
Exercise price per share |  |  |  |  |  |  | 12.22 |  | 16.53 |  | 20.50 |  |  | 26.01
Expiry date of Warrants | Jul. 01, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |
Trading days | 10 days |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average price of common stock exceeding exercise price | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage cash dividend from net income |  | 45.00% |  |  |  |  |  |  |  |  |  |  |  |
Decrease in exercise price per share |  |  |  |  |  | $ 2.79 |  | $ 3.77 |  | $ 4.67 |  |  | $ 5.93 |
Increase in number of warrants entitled for purchase |  |  |  |  |  | 4,216,253 |  | 4,386,218 |  | 4,386,218 |  |  | 6,579,322 |
Warrants exercised |  |  |  |  |  | 58,058 |  | 1 |  |  |  |  |  |
Shares issued to contingent value rights |  |  |  | 2,665,000 |  |  |  |  |  |  |  |  |  |
Strike price |  |  |  | $ 35.95 |  |  |  |  |  |  |  |  |  |
Decrease in Strike Price per share |  |  |  |  | $ 26.20 |  |  |  |  |  |  |  |  |
Increase in number of Shares |  |  |  |  | 3,657,157 |  |  |  |  |  |  |  |  |
Dividend equivalent amount of each Dividend per RSU or share of restricted stock |  | $ 2.1 |  |  |  |  |  |  |  |  |  |  |  |

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