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Indebtedness - Additional Information (Detail) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 Contract | Sep. 30, 2013
Debt Instrument [Line Items] |  |
Number of Interest rate swap contract outstanding | 1 |
Losses in other comprehensive income expected to be reclassified to earnings | $ 31,125,000 |
Duration of losses in other comprehensive income expected to be reclassified to earnings | 12 months |
Fixed interest rate for interest rate swap contract | 3.39% | 3.39%
Interest rate swap, start date | Mar. 30, 2011 |
Interest rate swap, termination date | Dec. 31, 2014 |
Maximum |  |
Debt Instrument [Line Items] |  |
Capacity to increase borrowings under credit agreement | 51,156,000 |
Cash Flow Hedging | Interest Rate Swap |  |
Debt Instrument [Line Items] |  |
Notional amount of interest rate swap | 87,000 |
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Senior secured credit facility | 200,000,000 |
Senior secured credit facility term | 5 years |
Revolving Credit Facility | Accordion Feature |  |
Debt Instrument [Line Items] |  |
Senior secured credit facility | $ 100,000,000 |

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