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Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis (Detail) (Assets measured at fair value on recurring basis [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Carrying Value [Member] \| Other non-current assets [Member]
Assets:
Available-for-sale securities	$ 1,236
Carrying Value [Member] \| Other current assets [Member]
Assets:
Derivative assets	4,912
Fair Value Measurement [Member] \| Other non-current assets [Member]
Assets:
Available-for-sale securities	1,236
Fair Value Measurement [Member] \| Other current assets [Member]
Assets:
Derivative assets	4,912
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] \| Other non-current assets [Member]
Assets:
Available-for-sale securities	1,236
Significant Other Observable Inputs (Level 2) [Member] \| Other current assets [Member]
Assets:
Derivative assets	$ 4,912

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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