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Changes in Shareholders' Equity - Changes in the Components of Shareholders' Equity (Detail) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Equity [Line Items]        
Balance, Amount     $ 399,845  
Net income $ 10,200 $ 7,688 36,013 $ 31,084
Other comprehensive income 16 $ (66) 62 $ 31
Share repurchases     (36,482)  
Stock options exercised     $ 6,564  
Stock options exercised, Shares     935  
Share-based compensation     $ 4,319  
Tax effect from employee share plans     369  
Convertible bond retirement     32,891  
Business acquisitions     1,976  
Balance, Amount 445,557   445,557  
Common Stock [Member]        
Equity [Line Items]        
Balance, Amount     $ 1,188  
Balance, Shares     118,820  
Restricted stock     $ 4  
Restricted stock, Shares     360  
Stock options exercised     $ 9  
Stock options exercised, Shares     935  
Convertible bond retirement     $ 51  
Convertible bond retirement, Shares     5,069  
Business acquisitions     $ 2  
Business acquisitions, Shares     214  
Balance, Amount $ 1,254   $ 1,254  
Balance,Shares 125,398   125,398  
Treasury Stock [Member]        
Equity [Line Items]        
Balance, Amount     $ (425,685)  
Balance, Shares     69,333  
Share repurchases     $ (36,482)  
Share repurchases, Shares     3,895  
Balance, Amount $ (462,167)   $ (462,167)  
Balance,Shares 73,228   73,228  
Additional Paid-In Capital [Member]        
Equity [Line Items]        
Balance, Amount     $ 604,284  
Restricted stock     (4)  
Stock options exercised     6,555  
Share-based compensation     4,319  
Tax effect from employee share plans     369  
Convertible bond retirement     32,840  
Business acquisitions     1,974  
Balance, Amount $ 650,337   650,337  
Retained Earnings [Member]        
Equity [Line Items]        
Balance, Amount     220,753  
Net income     36,013  
Balance, Amount 256,766   256,766  
Accumulated Other Comprehensive Loss [Member]        
Equity [Line Items]        
Balance, Amount     (695)  
Other comprehensive income     62  
Balance, Amount $ (633)   $ (633)