Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Additional Information (Detail)

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Property and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property Plant And Equipment [Abstract]        
Capital expenditure $ 44,200 $ 41,300 $ 127,100 $ 89,900
Asset impairment charges $ 37 $ 208 $ 16,698 $ 215