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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
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities $ 109,656 $ 86,910
Net cash used in financing activities (33,092) (18,043)
Net increase in cash and cash equivalents and restricted cash 27,976 12,854
Cash and cash equivalents and restricted cash, beginning of period 130,907 98,420
Cash and cash equivalents and restricted cash, end of period $ 158,883 111,274
As Reported [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities   96,318
Net cash used in financing activities   (14,548)
Net increase in cash and cash equivalents and restricted cash   25,757
Cash and cash equivalents and restricted cash, beginning of period   23,036
Cash and cash equivalents and restricted cash, end of period   $ 48,793