Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 01, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) Customer $ / shares shares	Dec. 31, 2015 Customer	Dec. 31, 2016 USD ($) Customer $ / shares shares	Dec. 31, 2015 Customer	Mar. 31, 2016 USD ($) Customer
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of shares of common stock repurchased | shares		318,344		420,098
Treasury Stock, Value, Acquired, Cost Method		$ 10,900,000		$ 15,100,000
Average price per share of common stock | $ / shares		$ 34.32		$ 36.00
Maturities of short term investment interest-bearing securities				90 days
Accounts receivable due period				30 days
Computer Software Property and Equipment [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortization period of computer software				5 years
Minimum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment				2 years
Maximum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment				7 years
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Maximum customer risk percentage		10.00%	10.00%	10.00%	10.00%
Number of customer | Customer		0	0	0	0
Credit Concentration Risk [Member] | Accounts Receivable [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Maximum customer risk percentage				10.00%		10.00%
Number of customer | Customer				0		0
Private Equity Funds [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Investment		$ 2,250,000		$ 2,250,000
Impairment recorded on investment				0		$ 0
Fair Value, Inputs, Level 2 [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Transfer of assets		0		0
Fair Value, Inputs, Level 3 [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Transfer of assets		$ 0		$ 0
Subsequent Event [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of shares of common stock repurchased | shares	113,765
Treasury Stock, Value, Acquired, Cost Method	$ 4,243,000
Average price per share of common stock | $ / shares	$ 37.29