Derivative Instruments (Detail) - Designated as Hedging Instrument - USD ($) $ in Thousands |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Interest rate swap agreements | Other short-term assets | ||
| Derivative [Line Items] | ||
| Derivative assets, Fair value | $ 516 | |
| Interest rate cap agreements | Other long-term assets | ||
| Derivative [Line Items] | ||
| Derivative assets, Fair value | $ 2,453 | $ 15,127 |