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Amount of Outstanding Debt and Notional Amount on Interest Rate Swap Contract (Detail) - Interest Rate Swap - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Outstanding Variable Rate Debt | $ 69,000 | $ 99,400 | $ 51,550
Notional Amount on Interest Rate Swap |  |  | $ 36,750

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
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