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Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Carrying amount of notes | $ 338.2 | $ 443.3
Level 3 [Member] |  |
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Approximate fair value of notes | $ 339.6 | $ 445.2

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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