Accounts Payable - Inventory Financing Facility - Additional Information (Detail) - USD ($) |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Accounts Payable And Accrued Expenses [Line Items] | |||
Inventory financing facility maximum borrowing capacity | $ 325,000,000 | ||
Inventory financing facility maturity date | Jun. 23, 2021 | ||
Imputed interest on inventory financing facility | $ 6,736,000 | $ 3,385,000 | $ 3,406,000 |
Inventory financing facility interest rate if balances are not paid within stated vendor terms | Prime plus 1.25% | ||
Inventory financing facility rate if vendor terms not met equal prime plus | 1.25% | ||
Maximum [Member] | |||
Accounts Payable And Accrued Expenses [Line Items] | |||
Inventory financing facility additional borrowing capacity | $ 25,000,000 |