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Summary of Significant Accounting Policies - Schedule of Adjusted Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating activities:    
Loss on extinguishment of debt   $ 1,495
Net cash flows provided by operating activities $ 56,942 58,111
Investing activities:    
Net cash used in investing activities (56,250) (68,793)
Financing activities:    
Payment on extinguishment of debt   (1,127)
Net cash used in financing activities 10,033 (2,396)
Net decrease in cash and restricted cash 10,725 (13,078)
Cash and restricted cash at beginning of period 71,238 79,209
Cash and restricted cash at end of period $ 81,963 66,131
Previously Reported    
Operating activities:    
Loss on extinguishment of debt   368
Net cash flows provided by operating activities   56,984
Investing activities:    
Changes in restricted cash   (1,225)
Net cash used in investing activities   (70,018)
Financing activities:    
Net cash used in financing activities   (1,269)
Net decrease in cash and restricted cash   (14,303)
Cash and restricted cash at beginning of period   68,922
Cash and restricted cash at end of period   54,619
Adjustments    
Operating activities:    
Loss on extinguishment of debt   1,127
Net cash flows provided by operating activities   1,127
Investing activities:    
Changes in restricted cash   1,225
Net cash used in investing activities   1,225
Financing activities:    
Payment on extinguishment of debt   (1,127)
Net cash used in financing activities   (1,127)
Net decrease in cash and restricted cash   1,225
Cash and restricted cash at beginning of period   10,287
Cash and restricted cash at end of period   $ 11,512