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Summary of Significant Accounting Policies - Schedule Related to Adoption of Accounting Standards (Share-Based Compensation and Restricted Cash and Cash Equivalents) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | $ 304,898 | $ 237,761 | $ 185,080
Net cash provided by (used in) financing activities | (35,733) | 10,727 | (18,857)
Net increase (decrease) in cash and cash equivalents and restricted cash | 117,101 | 32,487 | (34,658)
Cash and cash equivalents and restricted cash, beginning of period | 130,907 | 98,420 | 133,078
Cash and cash equivalents and restricted cash, end of period | 248,008 | 130,907 | 98,420
As Reported [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities |  | 218,286 | 173,900
Net cash provided by (used in) financing activities |  | 20,655 | (15,221)
Net increase (decrease) in cash and cash equivalents and restricted cash |  | 22,940 | (42,202)
Cash and cash equivalents and restricted cash, beginning of period | $ 45,976 | 23,036 | 65,238
Cash and cash equivalents and restricted cash, end of period |  | $ 45,976 | $ 23,036

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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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