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Fair Value Measurement - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013 securities	Dec. 31, 2012 securities
Fair Value Measurements Disclosure [Line Items]
Number of securities in unrealized loss position	18	16
Number of securities	48	38
Fixed Rate
Fair Value Measurements Disclosure [Line Items]
Long term debt, carrying value	$ 125.0

Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired.

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