Pro Forma Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Business Acquisition [Line Items]
Revenue	$ 532,978		$ 499,839
Net income	$ 35,814		$ 9,028
Net income per basic share	$ 0.47	[1]	$ 0.12	[1]
Net income per diluted share	$ 0.46	[1]	$ 0.12	[1]

[1] The per share amounts have been retroactively restated for all prior periods presented to reflect the Company's two-for-one common stock split effected in the form of a common stock dividend distributed on April 1, 2014. See Note 1 "Basis of Presentation" (d) for further discussion of the Stock Split.