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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
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