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Stockholders' Equity and Noncontrolling Interests - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 07, 2018
Mar. 31, 2019
Mar. 31, 2018
Class of Stock [Line Items]      
Nonvested stock, weighted average remaining contractual term   20 months  
Preferred stock, shares issued (in shares)   0 0
Preferred stock, shares outstanding (in shares)   0 0
Preferred stock, shares authorized (in shares)   1,000,000 1,000,000
Preferred stock, par value (usd per share)   $ 0.01 $ 0.01
Number of shares of common stock purchased   726,347 1,756,831
Repurchased common stock value   $ 56,436 $ 121,191
Treasury stock, shares (in shares)   12,227,773 12,680,105
Shares issued in ESPP (USD per share)   $ 62.55  
Shares issued in acquisition (in shares)   1,177,630  
Accelerated Share Repurchase Agreement [Member]      
Class of Stock [Line Items]      
Stock Repurchased and Retired During Period, Shares     1,495,714
Accelerated Share Repurchases, Settlement (Payment) or Receipt     $ 100,000
Accelerated Share Repurchases, Final Price Paid Per Share     $ 66.86
Alpha      
Class of Stock [Line Items]      
Initial purchase consideration $ 750,000    
Payments to acquire businesses 650,000    
Shares issued in acquisition, value $ 93,268    
Shares issued in acquisition (USD per share) $ 84.92    
Common Stock | Alpha      
Class of Stock [Line Items]      
Shares issued in employee stock purchase plan (in shares)   3,256  
Shares issued in acquisition (in shares) 1,177,630