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Subsequent Event - Additional Information (Detail) - Common Stock [Member] - Subsequent Event [Member] $ in Millions | Oct. 24, 2016 USD ($) shares
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Subsequent Event [Line Items] |
Sale of common stock, Shares | shares | 14,950,000
Proceeds from sale of common stock | $ 189.7
Underwriting commissions and discounts | 12.1
Legal, accounting fees, filing fees and other offering expenses | $ 0.6
Underwriters optional shares [Member] |
Subsequent Event [Line Items] |
Sale of common stock, Shares | shares | 1,950,000

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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