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Summary of Significant Accounting Policies (Cash and Cash Equivalents) - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents $ 117,366 $ 162,344 $ 128,771 $ 49,194 $ 65,427 $ 190,515
Cash equivalents 7,800   1,400      
Investments in Joint Ventures [Member]            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents 9,400   24,900      
Domestic Joint Ventures [Member]            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents 9,100   11,900      
Domestic Bank Accounts [Member]            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents 9,400   16,100      
Foreign Bank Accounts [Member]            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents $ 108,000   $ 112,700