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Derivative Financial Instruments - Schedule of Interest Rate Swap Agreements, Cash Flow Hedges (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Derivative [Line Items]
Fair Value Net Asset	$ 4,324
July 2012 Swap Transaction [Member]
Derivative [Line Items]
Notional Amount	150,000
Receive	Floating 1-month LIBOR
Pay	1.054%
Maturity Date	Jul. 18, 2017
Fair Value Net Asset	1,539
June 2013 Swap Transaction [Member]
Derivative [Line Items]
Notional Amount	150,000
Receive	Floating 3-month LIBOR
Pay	2.125%
Maturity Date	Jan. 15, 2021
Fair Value Net Asset	$ 2,785

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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