Summary Of Significant Accounting Policies (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 Ratio	Sep. 20, 2012	Dec. 31, 2011
Total number of authorized shares	170,000,000		170,000,000
Common stock	36,990,354
Par value of common stock	0.01		0.01
Additional paid-in capital	0.4
Contract term of the Convertible Notes, years	5
Capital Stock [Member]
Shares of capital stock authorized pre-split		86,000,000	51,000,000
Shares of capital stock authorized	171,000,000
Common Stock [Member]
Shares of common stock authorized pre-split		85,000,000	50,000,000
Total number of authorized shares	170,000,000
Forward stock split of common stock	2