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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
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities $ 269,927 $ 213,265
Net cash used in investing activities (112,084) (163,500)
Net cash provided by (used in) financing activities (33,004) (3,714)
Net increase in cash and cash equivalents and restricted cash 124,839 46,051
Cash and cash equivalents and restricted cash, beginning of period 130,907 98,420
Cash and cash equivalents and restricted cash, end of period $ 255,746 144,471
As Reported [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities   214,451
Net cash used in investing activities   (166,000)
Net cash provided by (used in) financing activities   3,656
Net increase in cash and cash equivalents and restricted cash   52,107
Cash and cash equivalents and restricted cash, beginning of period   23,036
Cash and cash equivalents and restricted cash, end of period   $ 75,143