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 Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Property Plant And Equipment [Abstract]        
Capital expenditure $ 27.0 $ 29.8 $ 48.6 $ 89.1