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Fair Value of Stock Settled Performance Units (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014
Performance Unit Awards 2014
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Fair value at date of grant	$ 5,388
Performance Unit Awards 2013
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Fair value at date of grant	5,564
Performance Unit Awards 2012
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Fair value at date of grant	3,065
Performance Unit Awards 2011
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Fair value at date of grant	$ 5,569

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Share Based Compensation Arrangement By Share Based Payment Award Grant Date Fair Value Of Awards

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