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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
	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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