Leases - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
Leases Disclosure [Line Items] | |||
Rent expense | $ 47.4 | $ 39.0 | $ 35.0 |