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Summary of Significant Accounting Policies - Summary of Adjustments to Quarterly Data Resulting from Adoption of New Standard in Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2016 | Jun. 30, 2016 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |
Net cash provided from operating activities |  |  |  | $ 816,254 | $ 387,068 | $ 691,402 |  |
Net cash (used in) provided from financing activities |  |  |  | $ 322,937 | $ (78,390) | (472,607) |  |
Accounting Standards Update 2016-09 |  |  |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |
Net cash provided from operating activities | $ 90,785 | $ 173,201 | $ 205,837 |  |  | 691,402 | $ 974,353 | $ 757,373
Net cash (used in) provided from financing activities | (75,834) | (99,008) | (39,029) |  |  | (472,607) | 271,203 | 226,159
As Reported | Accounting Standards Update 2016-09 |  |  |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |
Net cash provided from operating activities | 87,424 | 169,604 | 202,037 |  |  | 683,700 | 954,135 | 743,538
Net cash (used in) provided from financing activities | $ (72,473) | $ (95,411) | $ (35,229) |  |  | $ (464,905) | $ 291,421 | $ 239,994

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- Definition Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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