Taxation - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Stock compensation expense	$ 4,631	$ 4,922
Goodwill	3,110	0
Intangible assets	0	921
Other	2,419	902
Net operating loss carryforwards	2,006	1,833
Total deferred tax assets	12,166us-gaap_DeferredTaxAssetsGross	8,578us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:
Equipment	(1,096)	(1,610)
Intangible assets	(1,156)	0
Goodwill	0	(3,792)
Other	(306)us-gaap_DeferredTaxLiabilitiesOther	(925)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(2,558)us-gaap_DeferredIncomeTaxLiabilities	(6,327)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset before valuation allowance	9,608	2,251
Valuation allowances for deferred tax assets	(2,006)	(1,833)	(1,868)	(1,327)
Net deferred tax asset	$ 7,602us-gaap_DeferredTaxAssetsNet	$ 418us-gaap_DeferredTaxAssetsNet

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.

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