|
Derivative Instruments - Additional Information (Detail) (Interest Rate Swap Agreements [Member], USD $)
|
12 Months Ended |
|---|---|
|
Dec. 31, 2013
Interest_Rate_Swaps
|
|
| Derivative Instruments, Gain (Loss) [Line Items] | |
| Interest rate swap inception date | Dec. 16, 2013 |
| Number of forward-starting swap agreements | 3 |
| Derivative average Interest rate | 2.73% |
| Aggregated notional amount of interest swap agreements | $ 186,000,000 |
| Interest rate swap effective date | Dec. 31, 2015 |
| Derivative fixed Interest rate | 5.23% |
| Interest rate swap expiration date | Dec. 31, 2018 |
| Change in fair value of interest rate | 200,000 |
| Unrealized gains included in accumulated other comprehensive income | 0 |
| Unrealized gains reported in earnings | |
| Fair value of interest rate | 400,000 |
|
Floating LIBOR -Based Interest [Member]
|
|
| Derivative Instruments, Gain (Loss) [Line Items] | |
| Outstanding LIBOR-based debt | $ 186,000,000 |