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Other Noncurrent Assets - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Other Assets Non Current [Line Items] |  |  |
Notes receivable |  |  | $ 2,400,000
City Of Henderson |  |  |
Other Assets Non Current [Line Items] |  |  |
Notes receivable | $ 3,100,000 |  |
Annual interest rate | 6.00% |  |
City Of Henderson | Notes Payable |  |  |
Other Assets Non Current [Line Items] |  |  |
Debt instrument expiry year | 2036 |  |
OPA | City of Henderson Redevelopment Agency |  |  |
Other Assets Non Current [Line Items] |  |  |
Tax increment reimbursement percentage |  | 75.00% |
Aggregate amount of tax increment reimbursement receipts |  | $ 3,100,000 |
OPA | Maximum | City of Henderson Redevelopment Agency |  |  |
Other Assets Non Current [Line Items] |  |  |
Reimbursement revenue |  | $ 209,000,000 |

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