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Summary of Significant Accounting Policies (Cash and Cash Equivalents) - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 112,183 $ 128,771 $ 190,515 $ 488,777
Cash equivalents 8,800 1,400    
Investments in Joint Ventures [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 11,500 24,900    
Domestic Joint Ventures [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 10,000 11,900    
Domestic Bank Accounts [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 19,500 16,100    
Foreign Bank Accounts [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 92,700 $ 112,700