Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized	$ 3.8	$ 3.3	$ 2.9
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of employee contribution	30.00%
Percentage of employer contribution	3.00%