Derivative Instruments - Additional Information (Detail) - Interest Rate Swap Agreements |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
Dec. 16, 2013
USD ($)
Derivative
|
|
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Interest rate swap inception date | Dec. 31, 2015 | ||
| Number of forward-starting swap agreements | Derivative | 3 | ||
| Aggregated notional amount of interest swap agreements | $ 186,000,000 | ||
| Derivative average Interest rate | 2.73% | ||
| Derivative fixed Interest rate | 5.23% | ||
| Interest rate swap effective date | Dec. 31, 2015 | ||
| Interest rate swap expiration date | Dec. 31, 2018 | ||
| Change in fair value of interest rate | $ 1,100,000 | $ 2,400,000 | |
| Unrealized gains or losses included in accumulated other comprehensive income or loss | 0 | ||
| Fair value of the interest rate swap liability | $ 4,800,000 | $ 6,600,000 | |
| 2013 Credit Facility | |||
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Interest rate swap inception date | Dec. 16, 2013 | ||