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Summary of Debt Outstanding (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Term Loan Facility
    
Debt [Line Items]    
Term loan agreement $ 300,000 [1] $ 300,000 [1]
Revolving Credit Agreement
    
Debt [Line Items]    
Revolving line of credit    [1],[2]    [1],[2]
September 2013 Senior Unsecured Notes
    
Debt [Line Items]    
Aggregate debt outstanding 500,000 500,000
Weighted average remaining life in years 9 years 2 months 12 days 9 years 4 months 24 days
Weighted average coupon rate on notes outstanding 4.86% 4.86%
Fair value of debt outstanding (Level 2) 522,988 520,979
August 2011 Senior Unsecured Notes
    
Debt [Line Items]    
Aggregate debt outstanding 165,000 165,000
Weighted average remaining life in years 6 years 3 months 18 days 6 years 7 months 6 days
Weighted average coupon rate on notes outstanding 4.42% 4.42%
Fair value of debt outstanding (Level 2) 170,332 168,653
September 2010 Senior Unsecured Notes
    
Debt [Line Items]    
Aggregate debt outstanding 425,000 425,000
Weighted average remaining life in years 5 years 4 months 24 days 5 years 7 months 6 days
Weighted average coupon rate on notes outstanding 4.25% 4.25%
Fair value of debt outstanding (Level 2) 438,074 436,264
July 2003 Senior Unsecured Notes
    
Debt [Line Items]    
Aggregate debt outstanding 35,000 35,000
Weighted average remaining life in years 1 year 1 month 6 days 1 year 3 months 18 days
Weighted average coupon rate on notes outstanding 4.61% 4.61%
Fair value of debt outstanding (Level 2) $ 35,866 $ 36,018
[1] Fair values approximate carrying values because the borrowings bear interest at variable rates.
[2] $600.0 million was available under the revolver at June 30, 2014 and March 31, 2014.