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Derivatives and Hedging Instruments - Additional Information (Detail) AUD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 AUD contract instrument | Dec. 31, 2017 USD ($) contract instrument | Dec. 31, 2017 GBP (£) contract instrument
Derivative [Line Items] |  |  |  |  |  |
Number of interest rate cap contracts | contract |  |  |  | 2 | 2 | 2
Foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain (loss) reclassified from OCI into earnings |  | $ 0 | $ 0 |  |  |
Interest rate cap contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative instrument, notional amount |  |  |  |  | $ 405,300,000 | £ 300,000,000
Cash Flow Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative number of instruments held | instrument |  |  |  | 2 | 2 | 2
Cash Flow Hedges | Foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative instrument, notional amount |  |  |  |  | $ 12,600,000 |
Net derivative gain (loss) included in OCI to be reclassified into earnings | $ 1,900,000 |  |  |  |  |
Gain (loss) reclassified from OCI into earnings | $ 0 |  |  |  |  |
Cash Flow Hedges | Interest rate swap agreements |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative instrument, notional amount |  |  |  | AUD 30.0 | $ 23,400,000 |
Minimum | Derivatives Not Designated as Hedging Instruments | Cash Flow Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative term of contract | 1 month |  |  |  |  |
Maximum | Derivatives Not Designated as Hedging Instruments | Cash Flow Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative term of contract | 3 months |  |  |  |  |

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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 estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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