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Ownership, Description of Business, and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2015 | May 31, 2014 | Dec. 31, 2017 | Dec. 31, 2015 | Dec. 31, 2016 | Aug. 12, 2015 | Apr. 24, 2014
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings |  |  | $ 259,000 |  |  |  |
Restricted cash |  |  | 21,000,000 |  | $ 15,100,000 |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 50,000,000.0 | $ 50,000,000.0
Stock repurchased during period (in shares) | 839,295 | 400,000 |  |  |  |  |
Stock repurchased during period (amount) | $ 33,200,000 | $ 16,800,000 |  | $ 33,185,000 |  |  |
2017 Convertible Senior Notes |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Convertible debt |  |  | $ 115,000,000 |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 31.56 |  |  |  |
2017 Convertible Senior Notes | Adjusted Debt Conversion Rate Following Hedge Transactions |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 60.00 |  |  |  |
2020 Convertible Senior Notes |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Convertible debt |  |  | $ 172,500,000 |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 45.72 |  |  |  |
2020 Convertible Senior Notes | Adjusted Debt Conversion Rate Following Hedge Transactions |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 61.55 |  |  |  |
2021 Convertible Senior Notes |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Convertible debt |  |  | $ 161,000,000 |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 59.39 |  |  |  |
2021 Convertible Senior Notes | Adjusted Debt Conversion Rate Following Hedge Transactions |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 83.14 |  |  |  |
2022 Convertible Senior Notes |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Convertible debt |  |  | $ 150,000,000 |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 45.57 |  |  |  |
ASU 2018-02 |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings |  |  | $ 300,000 |  |  |  |

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- Definition Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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