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Notes, Loans Payable, and Financing Arrangements - Additional Information (Detail) - USD ($) |  | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 19, 2019 | Oct. 31, 2019 | Nov. 22, 2019 | Feb. 28, 2018 | Oct. 27, 2016 | Jul. 06, 2015 | Jun. 18, 2015 | Jun. 15, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest description of revolving line of credit |  | The Revolving Line provides for availability for general corporate purposes, with borrowings to bear interest at a variable rate equal to LIBOR or prime plus an applicable margin based on our consolidated leverage ratio, at our election. |  |  |  |  |  |
Credit facility, maturity |  | Jun. 15, 2020 |  |  |  |  |  |
Percentage of interest rate protection on term loan |  |  |  |  |  |  |  | 75.00%
Fair value of the interest rate swap asset |  | $ 92,000 |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of floating rate debt covered |  |  |  |  |  |  | 100.00% |
Derivative, notional amount |  |  |  |  |  |  | $ 105,000,000.0 |
Derivative, maturity date |  | Jun. 15, 2020 |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  | 1.56% |  |
Gain on termination of interest rate swap | $ 40,000 |  |  |  |  |  |  |
Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, borrowing capacity |  |  |  |  |  |  |  | $ 175,000,000.0
Credit Facilities |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings outstanding |  | $ 50,000,000.0 |  |  |  |  |  |
Outstanding letters of credit |  | $ 1,000,000.0 |  |  |  |  |  |
Credit Facilities | LIBOR Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on borrowings |  | 4.13% |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding debt |  | $ 78,200,000 |  |  |  |  |  | $ 105,000,000.0
Principal payments per annum |  | $ 6,300,000 |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  | 4.29% |  |  |  |  |  |
5.000% Senior Notes due 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes issued |  |  |  | $ 75,000,000.0 |  |  |  |
Debt issuance cost |  |  |  | $ 158,000 |  |  |  |
Debt instrument, interest rate |  |  |  | 5.00% |  |  |  |
Description of redemption for senior notes |  | As of February 28, 2019, we may, at our option, upon not less than 30 nor more than 60 days’ prior notice, redeem all or a portion of the 2020 Senior Notes at a redemption price of 100.000% of the principal amount of the 2020 Senior Notes to be redeemed plus accrued and unpaid interest as of the applicable redemption date. On December 5, 2019, we issued a notice of redemption to holders of our outstanding 5.000% Senior Notes that we intend to redeem all of our outstanding 5.000% Senior Notes on January 6, 2020, or the Redemption Date. The redemption price for the 5.000% Senior Notes will be 100% of the principal amount of the 5.000% Senior Notes, plus accrued and unpaid interest to, but not including, the Redemption Date. |  |  |  |  |  |
Redemption price of senior notes | 100.00% | 100.00% |  |  |  |  |  |
Debt instrument redemption date | Jan. 06, 2020 |  |  |  |  |  |  |
Second Amendment | Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, borrowing capacity |  |  |  |  | $ 350,000,000.0 |  |  |
Credit facility additional borrowing capacity option to increase maximum borrowing capacity |  |  |  |  | $ 150,000,000.0 |  |  |
Credit facility, maturity |  | Oct. 27, 2021 |  |  |  |  |  |
Fifth Amendment | Unsecured Revolving Credit Facility | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, borrowing capacity |  |  | $ 250,000,000.0 |  |  |  |  |
Credit facility additional borrowing capacity option to increase maximum borrowing capacity |  |  | $ (50,000,000.0) |  |  |  |  |

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