Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured	$ 1,229,801,000	$ 1,167,413,000
Liquidating distributions payable	48,978,000	42,111,000
Transfers between fair value amount	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured	0	0
Liquidating distributions payable