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Equity - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Feb. 28, 2016 | Aug. 31, 2015
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Shares repurchased pursuant to authorization |  |  | 819,738 |  |  |
Shares repurchased, value |  |  | $ 21,284,000 |  |  |
Share Repurchase Plan, August 2015 |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common stock authorized to repurchase by Board |  |  |  |  |  | $ 100,000,000
Shares repurchased pursuant to authorization | 839,130 |  |  |  |  |
Shares repurchased, value | $ 11,000,000 |  |  |  |  |
Share Repurchase Plan, February 2016 |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common stock authorized to repurchase by Board |  |  |  |  | $ 100,000,000 |
Shares repurchased pursuant to authorization | 49,683 | 0 |  |  |  |
Shares repurchased, value | $ 1,000,000 |  | 10,000,000 |  |  |
Available authorization remaining for repurchase | $ 90,000,000 |  | $ 90,000,000 |  |  |
Convertible notes |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Securities excluded in the calculation of diluted earnings per share | 0 | 11,825,450 | 9,345,433 | 21,292,309 |  |
Equity awards |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Securities excluded in the calculation of diluted earnings per share | 129,070 | 286,075 | 129,070 | 299,491 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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