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Convertible Senior Notes - Additional Information (Detail) - USD ($)
6 Months Ended
Dec. 17, 2013
Jun. 30, 2015
Dec. 31, 2014
Debt Disclosure [Line Items]      
Additional paid-in capital   $ 545,359,000 $ 538,553,000
Common shares sold (shares)   $ 66,000 $ 66,000
2.75% Convertible Senior Notes Due 2018 [Member]      
Debt Disclosure [Line Items]      
Sale of convertible notes, principal amount $ 120,000,000    
Conversion rate, shares (shares)   95  
Conversion rate, price per share ($ per share)   $ 1,000  
Money conversion price per share ($ per share)   $ 10.53  
Interest rate 2.75% 2.75%  
Convertible senior notes maturity date   Dec. 15, 2018  
Net proceeds from convertible notes $ 115,400,000    
Professional fee $ 4,600,000    
Additional paid-in capital   $ 13,100,000  
Common shares converted value (shares)   $ 11,400,000  
Strike price per share ($ per share)   $ 14.03  
Common shares sold (shares)   $ 11,400,000  
Threshold percentage of conversion price   130.00%  
Convertible senior notes trading price   $ 1,000  
Percentage of product of last reported sale price of common stock   98.00%  
Convertible senior notes conversion description   Prior to June 15, 2018, holders may convert all or a portion of their 2018 Convertible Notes only under any of the following circumstances: (1) during any fiscal quarter (and only during such fiscal quarter), if, for at least 20 trading days (whether or not consecutive) during the 30 consecutive trading day period ending on the last trading day of the immediately preceding fiscal quarter, the last reported sale price of our common stock on such trading day is greater than or equal to 130% of the Notes' conversion price on such trading day; (2) during the five consecutive business day period immediately following any five consecutive trading day period in which, for each trading day of that measurement period, the trading price per $1,000 principal amount of 2018 Convertible Notes for such trading day was less than 98% of the product of (i) the last reported sale price of our common stock on such trading day and (ii) the Notes' conversion rate on such trading day; (3) upon the occurrence of certain corporate transactions; and (4) at any time prior to our stockholders’ approval to settle the 2018 Convertible Notes in our common shares and/or cash.  
2.75% Convertible Senior Notes Due 2018 [Member] | Minimum [Member]      
Debt Disclosure [Line Items]      
Debt convertible trading days   20 days  
Debt convertible consecutive trading days   5 days  
2.75% Convertible Senior Notes Due 2018 [Member] | Maximum [Member]      
Debt Disclosure [Line Items]      
Debt convertible consecutive trading days   30 days