Credit Agreement - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended		1 Months Ended
	Dec. 31, 2013	Jul. 10, 2012	Mar. 26, 2010 Old Revolving Credit Facility
Debt [Line Items]
Revolving credit facility		$ 200	$ 185
Credit facility maturity term			3 years
Revolving credit facility, initiation date	Jul. 10, 2012
Revolving credit facility, expiration date	Jul. 10, 2017
Revolving credit facility, increase, additional borrowing	$ 300
Ratio of Debt to EBITDA to be maintained as per Revolver requirement	not more than 2.25 to 1
Ratio of EBITDA to interest expense to be maintained as per Revolver requirement	not less than 3.0 to 1
Maximum ratio of debt to EBITDA	2.25%
Minimum ratio of EBITDA	3.00%