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Stock - Based Compensation - Summary of Accumulated Stock Units (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Accumulated stock units	56,380	55,390
Average price	$ 35.31	$ 33.98

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- Definition

Deferred Compensation Arrangement With Individual Accumulated Stock Units For Deferred Board Fees

+ References

No definition available.

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- Definition

Deferred Compensation Arrangement With Individual Stock Average Price

+ References

No definition available.

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