Basis of Presentation - Summary of Impact of Adopting New Standard on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Apr. 01, 2019	Mar. 31, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Prepaid expenses and other current assets	$ 105,004	$ 90,179	$ 90,646
Operating lease right-of-use assets	319,698	327,329
Total assets	4,367,051	4,242,149	3,915,287
Accrued and other liabilities	330,011	346,674	308,268
Non-current operating lease liabilities	296,707	305,167
Other liabilities	118,824	104,115	120,826
Total liabilities	2,361,215	2,326,071	1,999,209
Total liabilities and equity	$ 4,367,051	4,242,149	$ 3,915,287
Impact of ASC 842 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Prepaid expenses and other current assets		(467)
Operating lease right-of-use assets		327,329
Total assets		326,862
Accrued and other liabilities		38,406
Non-current operating lease liabilities		305,167
Other liabilities		(16,711)
Total liabilities		326,862
Total liabilities and equity		$ 326,862