Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Taxes [Line Items]
Provision for income taxes	$ 15,883,000	$ 11,742,000
Unrecognized tax benefit	47,700,000		44,400,000
Net tax benefit from unrecognized tax benefits, if recognized	16,000,000		12,700,000
Undistributed earnings	5,900,000
Other business combinations [Member]
Income Taxes [Line Items]
Unrecognized tax benefits, increase resulting from acquisition	$ 3,300,000
Costa Rica [Member] | Tax Holiday Through December 31, 2018 [Member]
Income Taxes [Line Items]
Holiday tax rate	100.00%
Costa Rica [Member] | Subsequent Four Years [Member]
Income Taxes [Line Items]
Holiday tax rate	50.00%
Income tax holiday, term	4 years