Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary Of Significant Accounting Policy [Line Items]
Software development costs	$ 300,000	$ 300,000	$ 0
Equity investments		0
Loss on derivative instrument	0	0	11,652,000
Research and development expenses	4,800,000	2,800,000	2,600,000
Advertising expense	35,500,000	33,400,000	32,900,000
Prepaid advertising costs	3,900,000	3,600,000
Company contribution for employees	600,000	$ 300,000	$ 300,000
Interest rate contract (interest rate swap) [Member]
Summary Of Significant Accounting Policy [Line Items]
Swap agreements outstanding	$ 0
Minimum [Member]
Summary Of Significant Accounting Policy [Line Items]
Amount contributed to employee benefit plan, percentage of an employees salary	1.00%
Maximum [Member]
Summary Of Significant Accounting Policy [Line Items]
Amount contributed to employee benefit plan, percentage of an employees salary	4.00%