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Guarantor and Nonguarantor Financial Statements - Condensed Consolidating Statement of Cash Flows (Parenthetical) (Detail) | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 13, 2015 | Dec. 31, 2014 | Dec. 12, 2014 | Sep. 26, 2014
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4.875% Senior Notes [Member] |  |  |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 4.875% | 4.875% | 4.875% |  |  |
4.875% Senior Notes [Member] | CBRE [Member] |  |  |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  | 4.875% |  |  |  |
5.25% Senior Notes [Member] |  |  |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 5.25% | 5.25% |  | 5.25% | 5.25% | 5.25%
5.25% Senior Notes [Member] | CBRE [Member] |  |  |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 5.25% |  |
6.25% Senior Notes [Member] |  |  |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 6.25% |  |
6.25% Senior Notes [Member] | CBRE [Member] |  |  |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 6.25% |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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