Derivative Financial Instruments - Summary of Changes in AOCL (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Derivative [Line Items]
Accumulated other comprehensive loss beginning of period	$ (6,402)	$ (15,242)
Unrealized (loss) gain from changes in the fair value of the effective portion of the interest rate swaps	(3,289)	164
(Loss) gain included in other comprehensive loss	(1,929)	1,539
Accumulated other comprehensive loss end of period	(8,331)	(13,703)
Reclassification Out of Accumulated Other Comprehensive Income [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Derivative [Line Items]
Realized loss reclassified from accumulated other comprehensive loss to interest expense	$ 1,360	$ 1,375

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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