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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financial Assets
Non-qualified retirement savings plan assets	$ 6,102	$ 6,000
Derivatives	107	1
Total Assets	6,209	6,001
Financial Liabilities
Contingent consideration	(4,486)	(4,425)
Derivatives	(68)	(1)
Total Liabilities	(4,554)	(4,426)
Level 1 [Member]
Financial Assets
Non-qualified retirement savings plan assets	4,975	4,944
Derivatives
Total Assets	4,975	4,944
Financial Liabilities
Contingent consideration
Derivatives
Total Liabilities
Level 2 [Member]
Financial Assets
Non-qualified retirement savings plan assets	1,127	1,056
Derivatives	107	1
Total Assets	1,234	1,057
Financial Liabilities
Contingent consideration
Derivatives	(68)	(1)
Total Liabilities	(68)	(1)
Level 3 [Member]
Financial Assets
Non-qualified retirement savings plan assets
Derivatives
Total Assets
Financial Liabilities
Contingent consideration	(4,486)	(4,425)
Derivatives
Total Liabilities	$ (4,486)	$ (4,425)

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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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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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