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Subsequent Events - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	12 Months Ended
	Mar. 16, 2017	Feb. 28, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 31, 2013
4.25% Convertible Senior Notes (due 2018)
Subsequent Event [Line Items]
Debt instrument, interest rate			4.25%	4.25%	4.25%
Debt instrument, maturity year			2018	2018
Subsequent Event | 4.25% Convertible Senior Notes (due 2018)
Subsequent Event [Line Items]
Debt instrument, interest rate		4.25%
Debt instrument, maturity year		2018
Debt exchange transaction, aggregate principal amount of debt exchanged		$ 39.1
Debt instrument, remaining principal amount		$ 54.7
Subsequent Event | 4.25% Convertible Senior Notes (due 2018) | Common Stock
Subsequent Event [Line Items]
Debt exchange transaction, number of shares exchanged		2,900,000
Debt exchange transaction, value of shares exchanged		$ 24.1
Meisheng Culture Company | Subsequent Event
Subsequent Event [Line Items]
Common stock sold	3,660,891
Total purchase price of stock sold	$ 19.3

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