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Debt (Narrative) (Detail)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Nov. 30, 2015
USD ($)
Share
$ / shares
Dec. 31, 2016
USD ($)
Day
$ / shares
Dec. 31, 2015
USD ($)
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]        
Aggregate principal amount $ 143,750      
Aggregate proceeds from convertible senior notes     $ 143,750  
Senior notes, initial conversion price per share | $ / shares   $ 33.215    
Convertible Senior Notes, net        
Debt Instrument [Line Items]        
Aggregate principal amount 125,000 $ 143,750   $ 143,750
Aggregate principal amount of additional convertible debt 18,750      
Aggregate proceeds from convertible senior notes $ 143,750      
Debt interest rate 2.00%      
Number of common stock issue in conversion debt | Share 4,328      
Senior notes, initial conversion price per share | $ / shares $ 33.215      
Threshold multiple for debt conversion of notes   $ 1,000    
Threshold trading days for convertible debt | Day   20    
Threshold consecutive trading days for convertible debt   30 days    
Percentage of minimum stock price trigger for conversion   130.00%    
Maximum calculated percentage to which trading price of notes is compared in order to trigger conversion feature of notes   98.00%