Common Stock and Preferred Stock - Additional Information (Detail)		1 Months Ended					2 Months Ended		3 Months Ended		12 Months Ended
	Apr. 27, 2017 USD ($) shares	Oct. 31, 2016 shares	Mar. 31, 2016 USD ($) shares	Jan. 31, 2016 USD ($) ExecutiveOfficers Director shares	Jun. 30, 2014 USD ($) shares	Jul. 31, 2013 USD ($) shares	Feb. 28, 2017 USD ($) shares	Jan. 31, 2017 USD ($) ExecutiveOfficers Director shares	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Jun. 30, 2015 USD ($)
Class of Stock [Line Items]
Repurchase of common stock, shares | shares					3,112,840
Repurchase of common stock, value					$ 24,000,000
Repurchase of convertible senior notes									$ 24,052,000	$ 1,940,000
4.875% Convertible Senior Notes (due 2020)
Class of Stock [Line Items]
Amount of convertible notes repurchased and retired				$ 2,000,000
4.25% Convertible Senior Notes (due 2018)
Class of Stock [Line Items]
Amount of convertible notes repurchased and retired						$ 39,100,000			$ 6,100,000
Repurchase of convertible senior notes						$ 24,100,000
Common Stock | 4.25% Convertible Senior Notes (due 2018)
Class of Stock [Line Items]
Amount of convertible notes repurchased and retired							$ 39,100,000
Common stock shares issued upon conversion of debt instrument | shares						2,865,000	2,865,000
Common stock shares issued upon conversion of debt instrument, value							$ 15,100,000
Securities
Class of Stock [Line Items]
Retirement of common stock (share) | shares											1,766,284	1,547,361
Retirement of common stock											$ 13,500,000	$ 13,200,000
Securities | 4.875% Convertible Senior Notes (due 2020)
Class of Stock [Line Items]
Amount of convertible notes repurchased and retired											2,000,000
Repurchase of convertible senior notes											1,900,000
Securities | 4.25% Convertible Senior Notes (due 2018)
Class of Stock [Line Items]
Amount of convertible notes repurchased and retired											6,100,000
Repurchase of convertible senior notes											$ 6,100,000
Subsequent Event | Common Stock | Hong Kong Meisheng Cultural Co
Class of Stock [Line Items]
Common stock issued, shares | shares	3,660,891
Common stock issued, value	$ 19,300,000
Maximum | Restricted Stock
Class of Stock [Line Items]
Vesting period									5 years
Maximum | Securities
Class of Stock [Line Items]
Stock repurchase, authorized amount													$ 35,000,000
Executive officer
Class of Stock [Line Items]
Restricted stock issued, shares | shares			134,058	449,120				873,787
Restricted stock issued, value			$ 900,000	$ 3,600,000				$ 4,500,000
Number of executive officers | ExecutiveOfficers				2				2
Executive officer | Restricted Stock
Class of Stock [Line Items]
Vesting period								3 years
Non-employee directors
Class of Stock [Line Items]
Restricted stock issued, shares | shares		2,463		62,710				94,102
Restricted stock issued, value				$ 500,000				$ 500,000
Number of non-employee directors | Director				5				5
Non-employee directors | Restricted Stock
Class of Stock [Line Items]
Shares of restricted stock, vesting date		2017-01		2017-01				2018-01