Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Cash and Cash Equivalents) - Additional Information (Detail)

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Summary of Significant Accounting Policies (Cash and Cash Equivalents) - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 106,514 $ 112,183 $ 155,315 $ 128,771
Cash equivalents 8,100 8,800    
Investments in Joint Ventures [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 8,800 11,500    
Domestic Joint Ventures [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 7,700 10,000    
Domestic Bank Accounts [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 17,500 19,500    
Foreign Bank Accounts [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 89,000 $ 92,700