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Pension Information - Additional Information (Detail) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract] |  |
Additional benefits under pension plan | $ 0 |
Expected future employer contributions | $ 700,000 |
Employer contributions |  | $ 1,515,000

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- Definition Additional Benefits Under Pension Plan + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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