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Debt - January 2012, May 2014, and November 2015 Exchangeable Senior Notes - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
shares
Mar. 31, 2016
USD ($)
Nov. 30, 2015
USD ($)
May 31, 2014
USD ($)
Jan. 31, 2012
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
shares
Debt Disclosure [Line Items]                  
Proceeds from issuance of convertible debt, net of transaction costs             $ 30,000,000    
Convertible senior notes, repayment             15,107,000    
Convertible senior notes, carrying value, exchanged                 $ 127,300,000
Loss on change in fair value of derivative liabilities               $ 1,250,000  
Interest             $ 4,111,000 5,138,000  
Convertible Debt                  
Debt Disclosure [Line Items]                  
Convertible senior notes, stated interest rate             3.50%    
Convertible senior notes, principal amount                 150,000,000
Convertible notes, interest expense             $ 3,400,000    
Interest expense, contractual coupon interest             1,400,000    
Accrued interest on convertible note     $ 200,000       0 200,000  
Interest             300,000 2,500,000  
Convertible Debt | Non Cash                  
Debt Disclosure [Line Items]                  
Convertible notes, interest expense             2,000,000    
Convertible Debt | Cash                  
Debt Disclosure [Line Items]                  
Convertible notes, interest expense             100,000    
Convertible Debt | Common Shares                  
Debt Disclosure [Line Items]                  
Carrying amount of debt conversion option                 $ 40,100,000
Convertible Debt | American Depositary Shares                  
Debt Disclosure [Line Items]                  
Convertible senior notes, total ADS into which the debt is exchangeable | shares                 60,311,188
Transaction costs                 $ 700,000
Convertible Debt | 2012 Notes                  
Debt Disclosure [Line Items]                  
Convertible senior notes, principal amount       $ 15,100,000 $ 31,300,000 $ 150,000,000 0   15,100,000
Convertible senior notes, stated interest rate 3.50%         3.50%      
Convertible senior notes, due date 2032         2032      
Proceeds from issuance of convertible debt, net of transaction costs           $ 144,300,000      
Convertible senior notes, principal amount purchase $ 15,000,000     16,200,000     15,000,000    
Convertible senior notes, repurchase price at option of the issuer 100.00%         100.00%      
Convertible senior notes, aggregate principal amount redeemed             100,000    
Convertible senior notes, outstanding amount             0    
Carrying amount of debt conversion option             23,800,000    
Decrease to additional paid-in capital for repurchase of conversion option in convertible notes             $ 10,100,000    
Note, estimated remaining life           24 months 24 months    
Convertible senior notes, discount                 0
Convertible Debt | 2012 Notes | Other Debt Obligations                  
Debt Disclosure [Line Items]                  
Convertible senior notes, fair value             $ 126,200,000    
Convertible Debt | 2014 Notes                  
Debt Disclosure [Line Items]                  
Convertible senior notes, principal amount   $ 118,700,000     $ 118,700,000   $ 0   0
Convertible senior notes, stated interest rate         3.50%        
Convertible senior notes, due date         2032        
Convertible senior notes, principal amount         $ 118,700,000        
Convertible senior notes, repurchase price at option of the issuer             100.00%    
Convertible senior notes, fair value             $ 90,800,000    
Decrease to additional paid-in capital for repurchase of conversion option in convertible notes             1,300,000    
Convertible senior notes, discount             27,900,000    
Offering costs             2,500,000    
Derivative liability at fair value             3,500,000    
Loss on change in fair value of derivative liabilities     $ 700,000         700,000  
Convertible Debt | 2014 Notes | Final As-Adjusted | American Depositary Shares                  
Debt Disclosure [Line Items]                  
Convertible senior notes, exchange rate of ADS per $1,000 principal amount of notes   402.0746              
Convertible senior notes, total ADS into which the debt is exchangeable | shares   47,739,925              
Convertible Debt | 2015 Notes                  
Debt Disclosure [Line Items]                  
Convertible senior notes, principal amount   $ 31,300,000   $ 31,300,000     $ 0   0
Convertible senior notes, stated interest rate       3.50%          
Convertible senior notes, due date       2032          
Proceeds from issuance of convertible debt, net of transaction costs       $ 27,500,000          
Convertible senior notes, repayment       $ 15,900,000          
Equity component of convertible notes issuance cost                 87,400,000
Debt instrument increase accrued interest                 800,000
Convertible senior notes, repurchase price at option of the issuer             100.00%    
Convertible senior notes, fair value             $ 27,500,000    
Carrying amount of debt conversion option             11,500,000   $ 11,500,000
Convertible senior notes, discount             3,800,000    
Offering costs             100,000    
Derivative liability at fair value             $ 500,000    
Loss on change in fair value of derivative liabilities               $ 100,000  
Convertible Debt | 2015 Notes | Final As-Adjusted | American Depositary Shares                  
Debt Disclosure [Line Items]                  
Convertible senior notes, exchange rate of ADS per $1,000 principal amount of notes   402.0746              
Convertible senior notes, total ADS into which the debt is exchangeable | shares   12,571,263