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Summary of Debt Outstanding (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Term Loan Facility    
Debt [Line Items]    
Term loan agreement [1] $ 300,000 $ 300,000
Revolving Credit Agreement    
Debt [Line Items]    
Revolving line of credit [1],[2]   20,000
September 2013 Senior Unsecured Notes    
Debt [Line Items]    
Aggregate debt outstanding $ 500,000 $ 500,000
Weighted average remaining life in years 8 years 2 months 12 days 8 years 4 months 24 days
Weighted average coupon rate on notes outstanding 4.86% 4.86%
Fair value of debt outstanding (Level 2) $ 531,339 $ 516,879
August 2011 Senior Unsecured Notes    
Debt [Line Items]    
Aggregate debt outstanding $ 165,000 $ 165,000
Weighted average remaining life in years 5 years 3 months 18 days 5 years 7 months 6 days
Weighted average coupon rate on notes outstanding 4.42% 4.42%
Fair value of debt outstanding (Level 2) $ 172,175 $ 167,910
September 2010 Senior Unsecured Notes    
Debt [Line Items]    
Aggregate debt outstanding [3] $ 425,000 $ 425,000
Weighted average remaining life in years [3] 4 years 4 months 24 days 4 years 7 months 6 days
Weighted average coupon rate on notes outstanding [3] 4.25% 4.25%
Fair value of debt outstanding (Level 2) [3] $ 440,712 $ 431,296
July 2003 Senior Unsecured Notes    
Debt [Line Items]    
Aggregate debt outstanding $ 35,000 $ 35,000
Weighted average remaining life in years 1 month 6 days 3 months 18 days
Weighted average coupon rate on notes outstanding 4.61% 4.61%
Fair value of debt outstanding (Level 2) $ 35,075 $ 35,197
[1] Fair values approximate carrying values because the borrowings bear interest at variable rates.
[2] $600 million and $580 million were available under the revolver at June 30, 2015 and March 31, 2015, respectively.
[3] Principal repayments of approximately $42.5 million due during the twelve months ending June 30, 2016 are classified as long term debt in the accompanying balance sheet at June 30, 2015 because the company has the ability and intent to fund the repayments with borrowings under the credit facility which matures in June 2019.